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Los Osos High · Rancho Cucamonga

Los Osos High: High scores, healthy climate, strong attendance. We looked for a catch — we didn't find one.

Los Osos posts 39.5% exceeding the standard — versus 15.8% statewide — with climate numbers better than most. That doesn't make it perfect. It makes it worth a visit to find what numbers can't measure.

6001 Milliken Avenue, 91737 (opens in new tab)·Chaffey Joint Union High·Rancho Cucamonga·Grades 9-12·2,759 students·44% low-income·2024–25 CAASPP·(909) 477-6900·Website
2019–2025 trend · CDE CAASPP
This schoolCA avg
Scope6444
% Exceeded39%16%
% Met+65%36%
Grad rate96.3%86.6%
College readiness65.4%33.9%
Absence25.2%30.2%
Suspension3.4%3.6%
Scope Score
64
🌱 Building Momentum · Solid
ranked #220 statewide · #1 of 10 in Chaffey Joint Union High

Los Osos High scores 64 of 100 on SchoolScope's Scope Score — the 90th percentile of 2,160 California high schools (CDE CAASPP 2025).

Measures test performance, attendance, and climate — not arts, community, or your kid. How we score →

🌱 Building Momentum — This label means the data doesn't clearly sort the school one way or the other — ask what the school is proud of, and what it's working on.

CDE CAASPP 2025

Most rating sites would stop at “65% proficient” and call it done. Los Osos deserves a closer read. The school sits in Rancho Cucamonga, where two in five students qualify for free or reduced lunch — and reading the numbers without that context misreads the school.

Los Osos's low-income kids hit 74.3% proficiency in ELA — a number the same group reaches at 38.2% statewide. If you're trying to read past zip-code-driven test scores, that's the signal worth weighing.

The seven-year arc

Percentile among 2,160 high schools statewide

Has held the 90th-percentile line every tested year since 2019.

CA Dashboard
ELAYellow(Declined Significantly)MathYellow(Declined Significantly)

This school hasn't fully recovered from the pandemic: 65% meet the standard today, versus 69% in 2019 — a gap worth asking about on a visit.

ELA — % met or exceeded, by grade
Grade20192022202320242025
Grade 1181%82%79%82%79%
Math — % met or exceeded, by grade
Grade20192022202320242025
Grade 1158%53%51%49%51%

The story this school is actually telling

Proficient by 11th grade
65%
State 36%
Graduate
96%
State 87%
Pass an AP exam
65%
State 34%

Of 100 students here: 65 are proficient by 11th grade → 96 graduate → 65 pass an AP exam. The gaps between those bars are the questions to ask.

74.3%
Low-income · ELA · met standard

Los Osos's most underrated number

74.3% of low-income students met the ELA standard — versus 38.2% for the same group statewide. That's the strongest kind of signal a school can post: it holds across income lines.

Los Osos low-income: 74.3%State low-income: 38.2%

The 7 things our score weighs

Graduation rate
96.3%
State 86.6%
9.7pp above state avg
Exceeded standard
39.5%
State 15.8%
23.6pp above state avg
College readiness
65.4%
State 33.9%
AP exam pass rate above state avg
Met or exceeded
65.0%
State 35.7%
29.2pp above state avg
Chronic absenteeism
25.2%
State 30.2%
5.0pp below state avg
Suspension rate
3.4%
State 3.6%
0.2pp below state avg
EL proficiency (ELPAC)
16.3%
State 18.0%
1.7pp below state avg
Worth a school visit

Ask what the school is working on next. Strong numbers tell you where a school is, not where it's going.

  • Ask whether extra support — tutoring, counseling, small groups — reaches kids across income lines, not just the students already ahead.
  • Ask whether the tour can step into a working classroom — watch how the teacher handles a student who's stuck.
  • Ask to tour while school's in session, and notice how hallways and transitions feel — culture shows up between classes, not just in them.
  • Ask how the school communicates with families when a child starts to struggle.
  • Ask what a typical day looks like for a new student in the first few weeks.

How every group of students does here

At Los Osos High in Rancho Cucamonga, 74.3% of low-income students met or exceeded the ELA standard in 2025, compared to 63.9% district-wide and 38.2% statewide. Los Osos High outperforms its district average for low-income students by 10.4 percentage points in ELA. Other subgroups: Low-Income students (43.3% Math proficient); Hispanic students (75.7% ELA proficient). The largest proficiency gap is 45.7 percentage points for english learner students. Data source: California Department of Education, CAASPP 2024-25. 284 students tested.

All students at this school: 65% met or exceeded
All StudentsAll Students: this school 65%, district —, state 36%65%
FemaleFemale: this school 68%, district 54%, state 44%68% · +3 vs school
MaleMale: this school 62%, district 49%, state 42%62% · −3 vs school
Socioeconomically DisadvantagedSocioeconomically Disadvantaged: this school 59%, district 46%, state 32%59% · −6 vs school
Hispanic/LatinoHispanic/Latino: this school 58%, district 46%, state 32%58% · −7 vs school
WhiteWhite: this school 62%, district 63%, state 56%62% · −3 vs school
AsianAsian: this school 86%, district 76%, state 72%86% · +21 vs school
Students with DisabilitiesStudents with Disabilities: this school 23%, district 16%, state 15%23% · −42 vs school
Black/African AmericanBlack/African American: this school 50%, district 42%, state 26%50% · −15 vs school
Two or More RacesTwo or More Races: this school 58%, district 54%, state 56%58% · −7 vs school
FilipinoFilipino: this school 76%, district 78%, state 65%76% · +11 vs school
English LearnersEnglish Learners: this school 34%, district 13%, state 11%34% · −31 vs school
HomelessHomeless: this school 50%, district 33%, state 22%50% · −15 vs school
Military-ConnectedMilitary-Connected: too few students to report‹11
American Indian/Alaska NativeAmerican Indian/Alaska Native: too few students to report‹11
Pacific IslanderPacific Islander: too few students to report‹11
Foster YouthFoster Youth: too few students to report‹11
this school district, same group California, same group
AP access · 2020-21 federal civil rights snapshot (structural, dated — newest published; biennial)
Shown, never scored
Hispanic24.9% AP · 37.4% enroll.
American Indian/Alaska Native0.1% AP · 0.5% enroll.
Asian39.8% AP · 21.3% enroll.
Native Hawaiian/Pacific Islander0.9% AP · 0.5% enroll.
Black5.3% AP · 6.1% enroll.
White26.2% AP · 31.6% enroll.
Two or more races2.7% AP · 2.7% enroll.
English learners2.4% AP · 3.1% enroll.
Students with disabilities0.5% AP · 8.9% enroll.

● share of AP enrollment vs share of total enrollment, this school only · not part of the Scope Score

Data source: U.S. Dept. of Education Office for Civil Rights, Civil Rights Data Collection, 2020-21 (biennial; newest published)

Showing up, and staying in class

Chronic absenteeismChronic absenteeism: this school 25.2%, district 34.8%, state 30.2%25.2% · −5.0pp vs state
Suspension rateSuspension rate: this school 3.4%, district —, state 3.6%3.4% · −0.2pp vs state
Chronic absenteeism by grade band
Grades 9–1225.0%

Where graduates go

Context — none of this enters the Scope Score

In fall 2025, 107 of Los Osos's 677 graduates enrolled in the University of California system — Riverside the most common landing, with 49 enrollees.

Applied242fall 2025, universitywide
Admitted189
Enrolled107
Where they landed (fall 2025)
Riverside 49Irvine 16Los Angeles 11Berkeley 9San Diego 7Davis 5Santa Barbara 5Santa Cruz 3Merced ‹3

campuses never sum to the universitywide figure — students apply to several

College destination mix, class of 2023

Class of 2023: 666 completers, 81% enrolled somewhere within a year

University of California 115 (17%)California State University 103 (15%)California community college 237 (36%)In-state private 42 (6%)Out-of-state, 4-year 43 (6%)Out-of-state, 2-year 2 (0%)Not enrolled 124 (19%)

Percentages are computed by SchoolScope (count ÷ completers) from CDE-reported counts, not a CDE-native rate.

Data source: California Department of Education, 2023 cohort — the newest published; National Student Clearinghouse match.

UC enrollees, universitywide, 2014–2025

Peak: 123 enrolled, 2023

UC publishes this trend back to 1994 — no other destination has a comparable multi-year record

UC is one road of many — the full destination mix for the class of 2023 is below. And who applied isn't who the school taught: the ratio between the two reflects the self-selected pool of students who chose to apply, not what happened in the classroom. By the state's 2023 count, 81% of this class's predecessors enrolled in college somewhere within a year. More of the class of 2023 enrolled at community colleges (237) than at UC (115).

Data source: University of California Office of the President (UC Information Center), fall 2025 admissions cycle · college-going rate: California Department of Education, 2023 cohort.

The people teaching here

Context — never part of the Scope Score
Student : teacherStudent to teacher ratio: this school 26:1, district 24:126:1
Teaching staff111 teachers
Avg. experience16.9 years
Fully credentialed92%
First-year teachers5%
Intern / emergency permit1.7%
Salary Schedule
Teacher salary schedule$63,832 – $151,282
Principal salary$0 – $210,457
Superintendent salary$344,190

Pay is set by the district, not the school.

Course Breadth
AP exam qualifiers333 studentsCCI, participation not authorization
CTE pathway completers74 students
Advanced Coursework

Los Osos's teachers are authorized to teach 25 of the 40 AP subjects the College Board offers — well above the 14-subject median among California schools that offer AP at all — including Calculus BC, Calculus AB, and Physics 1.

AP subjects taught25
Math & Computer Science (4)Calculus AB · Calculus BC · Computer Science Principles · Statistics
Sciences (4)Biology · Chemistry · Environmental Science · Physics 1
English (2)English Language and Composition · English Literature and Composition
History & Social Science (7)African American Studies · Human Geography · Macroeconomics · Psychology · U.S. Government and Politics · United States History · World History: Modern
World Languages & Cultures (4)Chinese Language and Culture · French Language and Culture · Spanish Language and Culture · Spanish Literature and Culture
Arts (2)2-D Art and Design · Drawing
AP Capstone (2)Research · Seminar

Data source: College Board AP Course Audit, 2025 - 2026 audit year (authorization, not enrollment) · IB World Schools directory, name-matched · structural depth: 2020-21 federal snapshot, table 09

What gets spent here

Per-pupil spendingPer-pupil spending: $16,786, CA average $14,491$16,786 · spent at this school
Federal share$299 per student

$299 per student arrives as federal Title funding — a measure of concentrated need, not school quality.

District current expense · FY 2024–25$18,946 per student

The district's current expense of education per student, from CDE's annual SACS filing — the freshest district spending figure the state publishes.

Where the district's dollars go · FY 2024–25 · CDE SACS
Instruction62%
Instruction support11%
Student services11%
Administration5%
Buildings & maintenance11%
Other1%

District-level, from the district's own SACS general-ledger filing — school-by-school breakdowns aren't published by the state.

district detail, 2016–2020 — the newest published
2020$13,126 per pupil
2019$12,897 per pupil
2018$13,298 per pupil
2017$12,162 per pupil
2016$12,487 per pupil

Source: NCES F-33 · Full district breakdown →

The neighborhood it serves

Hispanic41.4%
District 64.8% · CA 56.1%
White24.5%
District 12.8% · CA 19.9%
Asian19.6%
District 7.5% · CA 10.2%
Other8.6%
District 7.0% · CA 9.0%
Black5.9%
District 7.8% · CA 4.8%
Low IncomeFree/reduced lunch eligible 43.7% (20pp below CA avg)
Neighborhood — American Community Survey
Median income$122K · CA $85K
Median home value$878K · CA $659K
Bachelor's degree+41% · CA 35%
ZIP population22,958
Median age45 years

Source: U.S. Census Bureau, American Community Survey 5-year estimates (2024) · ZIP-level

Worth Knowing

At 2,759 students, this school is well above the typical California high school (≈1450).

On the state's science test (CAST), 38% met or exceeded the standard — science is tested in grades 5 and 8 but never enters the Scope Score.

Frequently asked questions

Is Los Osos High a good high school?

Los Osos High has a Scope Score of 64 out of 100, placing it in the 90th percentile of California high schools and ranked #220 statewide. 39.5% of students exceeded the state standard on the 2025 CAASPP assessment, which is 23.6 percentage points above the California average of 15.8%. The Scope Score weights 7 dimensions for high schools: graduation rate (25%), exceeded standard (22%), college/career readiness (20%), met or exceeded (proficient) (18%), chronic absenteeism (5%), suspension rate (5%), and ELPAC English Learner proficiency (5%). Data source: California Department of Education CAASPP 2025, analyzed by SchoolScope.

What are Los Osos High's CAASPP test scores?

On the 2025 CAASPP Smarter Balanced Assessment, 65.0% of students at Los Osos High met or exceeded the state standard in ELA and Math combined, and 39.5% exceeded it. The gap between those numbers matters: 25.5% of students are at the proficiency floor, while 39.5% pushed past it. Most rating sites report only the combined "proficient" number. SchoolScope surfaces the exceeded-vs-met split because it reveals whether a school's curriculum challenges students beyond minimum proficiency or paces toward it. 1,245 student-subject combinations were assessed.

How does Los Osos High rank in California?

Los Osos High ranks #220 among California high schools by Scope Score, placing it in the 90th percentile. This ranking is based on a weighted composite of 2025 CAASPP test performance (exceeded and met rates), chronic absenteeism, and suspension rate. Unlike single-number ratings, the Scope Score shows what drives the ranking so parents can decide what matters most to their family. See full methodology.

What is the attendance and school culture like at Los Osos High?

25.2% of students at Los Osos High are chronically absent (missing 10% or more of school days), which is better than the California average of 30.2%. The suspension rate is 3.4%. SchoolScope includes these culture metrics in the Scope Score because they reflect day-to-day school experience in ways test scores alone cannot.

How does Los Osos High compare to other schools in Rancho Cucamonga?

Los Osos High scores 64/100 (90th percentile) among California high schools. To compare with nearby schools, SchoolScope shows the same metrics side by side: exceeded rate, proficiency, growth trajectory, and school culture indicators. The school serves 2,759 students. Use the schools in Rancho Cucamonga page or the map view to compare all high schools nearby.

How does Los Osos High serve low-income and underrepresented students?

At Los Osos High in Rancho Cucamonga, 74.3% of low-income students met or exceeded the ELA standard in 2025, compared to 63.9% district-wide and 38.2% statewide. Los Osos High outperforms its district average for low-income students by 10.4 percentage points in ELA. Other subgroups: Low-Income students (43.3% Math proficient); Hispanic students (75.7% ELA proficient). The largest proficiency gap is 45.7 percentage points for english learner students. Data source: California Department of Education, CAASPP 2024-25. 284 students tested. SchoolScope shows disaggregated test scores by demographic subgroup so you can see how a school performs for your child's specific group — not just the school-wide average. Subgroup data is context, not part of the Scope Score: we don't penalize schools for who they serve. See our equity approach.

What AP courses are offered at Los Osos High?

Los Osos High's teachers are authorized to teach 25 of the 40 AP subjects the College Board offers, per the 2025 - 2026 AP Course Audit: 2-D Art and Design, African American Studies, Biology, Calculus AB, Calculus BC, Chemistry, Chinese Language and Culture, Computer Science Principles, Drawing, English Language and Composition, English Literature and Composition, Environmental Science, French Language and Culture, Human Geography, Macroeconomics, Physics 1, Psychology, Research, Seminar, Spanish Language and Culture, Spanish Literature and Culture, Statistics, U.S. Government and Politics, United States History, World History: Modern. Authorization means the school may teach a course, not that a section is running this year, and it's separate from AP exam pass rates. Data source: College Board AP Course Audit, analyzed by SchoolScope.

How many students from Los Osos High go to UC?

In fall 2025, 107 Los Osos High graduates enrolled at University of California campuses, universitywide. That figure can't be split into a per-campus sum — students apply to several UC campuses at once, so campus-level counts don't add up to the universitywide total. UC is one destination among many: this says nothing about graduates who chose a CSU, a private college, a community college, or work, and it is a count, not a rate or a ranking. Data source: University of California Office of the President (UC Information Center), fall 2025 admissions cycle.

Your other options

All schools in Rancho Cucamonga →

Private alternatives nearby

Private schools within ~10 miles. These schools do not participate in state testing and cannot be scored or ranked.

For the data nerds

Every number on this page

Score factors, grade-level breakdowns, subgroup proficiency, and peer comparisons.

01Score factorsWeighted composite · 2024–25
Graduation rate · 25%
96.3%
↑ vs CA 86.6% · 60th pctile
Exceeded standard · 22%
39.5%
↑ vs CA 15.8% · 75th pctile
College readiness · 20%
65.4%
↑ vs CA 33.9% · 67th pctile
Met or exceeded · 18%
65.0%
↑ vs CA 35.7% · 71th pctile
Chronic absenteeism · 5%
25.2%
↑ vs CA 30.2% · 54th pctile
Suspension rate · 5%
3.4%
↑ vs CA 3.6% · 51th pctile
EL proficiency (ELPAC) · 5%
16.3%
↓ vs CA 18.0% · 50th pctile
02By grade & subgroupCAASPP 2024–25 · % of tested students
ELATestedEXCMETNEARNOTMET++/CA
Grade 1162451%28%14%7%79%+32
MathTestedEXCMETNEARNOTMET++/CA
Grade 1162128%23%23%26%51%+28
Science (CAST)TestedEXCMETNEARNOT
Grade 5/8/1163614%23%52%10%

CAST is tested in grades 5, 8, and once in high school — not annually. Not part of the Scope Score.

Subgroup · ELATestedMET+vs districtvs CA
Socioeconomically Disadvantaged28474.3%+10+36
Hispanic/Latino25175.7%+11+37
White15175.5%−1+14
03Peer comparison · nearest high schoolssorted by Scope Score
SchoolDistScopeEXCMET+GrowthSusp
Los Osos High ←—6439.5%65.0%—3.4%
Rancho Cucamonga High0.9 mi5833.2%59.0%—4.5%
California average—4415.8%35.7%—3.6%
04More measurescontext · not all part of the Scope Score
Graduation Rate
96.3%
AP Exam Prepared
65.4%
A-G Completion
77.8%
A-G are the 15 courses (across 7 subjects) required for UC/CSU eligibility
College-Going Rate
81.4%
YearScopePctileRankExcMet+AbsentSuspGrowth
20196992#17139.0%69.5%8.2%3.6%—
20226692#17038.3%67.1%31.3%3.5%—
20236692#16839.1%65.1%18.5%4.3%—
20246693#15839.4%65.2%16.4%2.1%—
20256490#22039.5%65.0%25.2%3.4%—
NO STATEWIDE TESTING 2020–21 (COVID) · SCORE AND PERCENTILE ARE RELATIVE TO EACH YEAR'S FIELD
05Climate by student groupchronic absenteeism · 2019 vs 2025 — the two years CDE publishes at subgroup level
Group20192025Δ
Female8.8%27.7%+18.9pp
Male6.9%22.4%+15.5pp
Asian5.8%13.7%+7.9pp
Black/African American7.1%38.3%+31.2pp
White2.4%13.2%+10.8pp
Hispanic/Latino8.9%27.7%+18.8pp
American Indian/Alaska Native6.7%——
Pacific Islander6.7%——
Two or More Races6.3%24.1%+17.8pp
Students with Disabilities14.4%37.9%+23.5pp
English Learners9.7%22.7%+13.0pp
Homeless14.7%38.9%+24.2pp
Socioeconomically Disadvantaged10.7%30.7%+20.0pp
All Students7.8%25.0%+17.2pp
Filipino—50.0%—
Foster Youth—81.8%—
06UC admissions, universitywide2014–2025 · summed across CEEB codes at query time
YearAppliedAdmittedEnrolledGPA (applied)GPA (admitted)GPA (enrolled)
20252421891073.833.994.00
20242622171183.954.034.10
20232662081233.884.024.06
20222842021213.944.054.12
20212761961123.884.044.06
20202311711083.914.014.05
20192712011223.873.984.00
20182711791143.773.994.00
20172211741073.723.873.87
2016233168933.653.803.80
2015215149853.743.923.91
2014212141813.703.863.85

‹n = UC masks counts below n · a missing year means zero or masked — never assume zero · GPA cells blank for years with more than one contributing CEEB code (a summed GPA would be fabricated math) · GPAs live here and nowhere else on this page · Applied/Admitted/Enrolled reflect who applied, not what the school taught — no admit rate is computed or implied by this table. Series shown from 2014; full record to 1994 at the UC Infocenter.

07UC admissions by campuslatest falls on file
CampusYearAppliedAdmittedEnrolled
Berkeley2025127159
Berkeley2024154238
Berkeley2023154258
Berkeley20221573719
Berkeley20211332010
Davis202587345
Davis202411759‹3
Davis202310232‹3
Davis202211940‹3
Davis2021107454
Irvine20251995716
Irvine20242299926
Irvine202321311751
Irvine20222427528
Irvine20212117526
Los Angeles20251731711
Los Angeles20242172313
Los Angeles2023200147
Los Angeles20222172416
Los Angeles2021202209
Merced20255754‹3
Merced20243230‹3
Merced202337334
Merced202238363
Merced202135353
Riverside202518515649
Riverside202419016037
Riverside202320414935
Riverside202219214233
Riverside202117813236
San Diego2025184317
San Diego20242215618
San Diego20232033711
San Diego2022216354
San Diego20212006213
Santa Barbara2025129375
Santa Barbara2024165646
Santa Barbara202315440‹3
Santa Barbara20221694510
Santa Barbara2021151475
Santa Cruz202572503
Santa Cruz202492676
Santa Cruz202394596
Santa Cruz202285436
Santa Cruz202175506
Universitywide2025242189107
Universitywide2024262217118
Universitywide2023266208123
Universitywide2022284202121
Universitywide2021276196112

Σ campuses ≠ universitywide — students apply to several campuses; the Universitywide row (muted) is its own independent count, never a sum of the rows above it.

08AP course catalog2025 - 2026
SubjectTaught by
2-D Art and Designthis school
African American Studiesthis school
Biologythis school
Calculus ABthis school
Calculus BCthis school
Chemistrythis school
Chinese Language and Culturethis school
Computer Science Principlesthis school
Drawingthis school
English Language and Compositionthis school
English Literature and Compositionthis school
Environmental Sciencethis school
French Language and Culturethis school
Human Geographythis school
Macroeconomicsthis school
Physics 1this school
Psychologythis school
Researchthis school
Seminarthis school
Spanish Language and Culturethis school
Spanish Literature and Culturethis school
Statisticsthis school
U.S. Government and Politicsthis school
United States Historythis school
World History: Modernthis school

Authorization ≠ a section running this year — the Ledger records what the school may teach, not seat counts.

09Advanced coursework — 2020-21 federal civil-rights snapshotstructural, dated — newest published; biennial
MeasureThis school
AP offeredoffered
AP course count23
AP enrollment844
IB participationnot offered
Dual enrollmentoffered · 33 enrolled
Algebra I in grade 8not reported
Calculus sections6
Physics sections6
Chemistry sections24
Total enrollment (CRDC)2,955

Shown, never scored — no entry to any composite. NULL/reserve codes render "not reported," never a fabricated zero. The equity block above this table (§4) is the per-subgroup view of this same collection.

10College destinationsclass of 2023 · CDE 12-mo College-Going Rate
DestinationCompleters% (derived)
University of California11517.3%
California State University10315.5%
California community college23735.6%
In-state private426.3%
Out-of-state, 4-year436.5%
Out-of-state, 2-year20.3%
Not enrolled12418.6%

666 completers, class of 2023 · state-reported college-going rate 81% · % column is computed by SchoolScope (count ÷ completers), not a CDE-native rate · a missing cell is CDE suppression, never a fabricated zero · source: CDE 12-mo CGR, 2023 cohort (the newest published), National Student Clearinghouse match — a different, older vintage than the fall 2025 UC admissions rows in tables 06-07 above.

EXC = exceeded standard · MET+ = met or exceeded ("proficient") · Source: CA Dept. of Education · CAASPP 2024–25 · n=2,160 high schools · Vintages: climate subgroups 2019+2025 · district finance per its label · ACS 2022 · UC Infocenter (annual refresh, summer) — ‹5/‹3 = masked, never summed across campuses · AP Course Ledger 2025 - 2026 (November refresh; authorization not enrollment) · CRDC 2020-21 (biennial; next expected 2021-22) · CDE 12-mo CGR 2023 cohort, National Student Clearinghouse match · Data updated 2026-07-03methodology · data updates · CSV · report issue

SchoolScope scores and verdicts are our interpretation of public California Department of Education data — independent analysis, not an official rating. How we analyze · Request a correction

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