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Delta Keys Charter

Q: Is Delta Keys Charter a good school?

Delta Keys Charter ranks 1580 th of 2137 California alternative schools. SchoolDigger rates this school 1 star out of 5.

Public, Charter, Virtual, Alternative Grades K-12

1580^th

SchoolDigger Rank ?

of 2,137 California Alternative Schools

Better than 26% of California alternative schools

Summary

Delta Keys Charter is a small alternative school in Tracy, California, serving 125 students in grades K–12 in the New Jerusalem Elementary area. In 2025–26, its proficiency rates were 21% in English language arts (ELA), 15% in math, and 20% in science, all below district and state results. Its graduation rate was 47%, compared with 78% for the district and 88% statewide, making low graduation the most serious concern.

Compared with the state, Delta Keys was behind by 28 percentage points in ELA, 23 in math, and 16 in science; its gaps with the district were 11, 8, and 2 points, respectively. ELA is its clearest weakness among nearby schools: it had the lowest result among six with 2025–26 results, and its 21% was 14 points below their average. It ranked second-lowest in math, while science was a relative strength—not a high score, but closer to local results. Delta Keys’ 20% in science tied with Delta Home Charter; only Open Valley Independent Study was lower.

Results have improved since 2022–23, rising 3 points in ELA, 13 in math, and 10 in science, but each subject fell from 2024–25: by 8 points in ELA, 21 in math, and 3 in science. The sharp swings suggest a single year may not reflect the longer pattern. In 2024–25, the student-teacher ratio was 17.8, lower than the ratios at six of eight nearby schools with reported figures. The school reported that 73% of students were free/reduced lunch eligible in 2024–25, versus a nearby-school average of 67%; this is context, not an explanation for results. No SchoolDigger rank or star rating was provided for Delta Keys.

125

Students ?

17.8

Student/teacher ratio ?

$30,928

Per pupil spending ?

72.8%

Free/reduced lunch eligible (2024-25) ?

All students in California receive free school meals.

31400 South Koster Rd.
Tracy, CA 95330-8824

(209) 830-6363

District: New Jerusalem Elementary

Racial breakdown:

Hispanic:

64.0%

White:

13.6%

Two or more races:

8.0%

See top rated California elementary schools

Compare Delta Keys Charter to nearby alternative schools!

At a glance

▬ Ranking trend: Holding steady — 24th percentile in 2019 → 26th in 2026

Worth a look

!Test scores below the California average (19% vs 42% meeting standards)

!Graduation rate below the California average (46% vs 88%)

!Dropout rate above the California average (17% vs 8%)

Students meeting standards (2025-2026) ?

This school19%

District avg27%

California avg42%

1,580^th of 2,137

California public high schools ?

Bottom 26%▲ up 2 pts since 2019

See the entire ranking list of California High Schools →

★★★★★

SchoolDigger rating ?

4^th of 8Alternative Schools in the New Jerusalem Elementary

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	California percentile	Rating
2026	25.3	1580 of 2137	26.1%	★☆☆☆☆
2025	47.8	1077 of 2162	50.2%	★★★☆☆
2024	25.0	1584 of 2159	26.6%	★☆☆☆☆
2023	19.8	1707 of 2170	21.3%	★☆☆☆☆
2022	14.8	1797 of 2123	15.4%	★☆☆☆☆
2021	10.0	1174 of 1290	9.0%	☆☆☆☆☆
2019	20.1	1622 of 2133	24.0%	★☆☆☆☆

English Language Learner

Year	Avg score	Statewide rank	California percentile	Rating
2022	34.4	690 of 1044	33.9%	★★☆☆☆

Female

Year	Avg score	Statewide rank	California percentile	Rating
2026	28.3	1361 of 1865	27.0%	★☆☆☆☆
2025	39.9	1129 of 1906	40.8%	★★☆☆☆
2024	12.3	1701 of 1915	11.2%	★☆☆☆☆
2023	15.2	1626 of 1915	15.1%	★☆☆☆☆
2022	12.8	1650 of 1858	11.2%	★☆☆☆☆
2021	6.7	1011 of 1054	4.1%	☆☆☆☆☆
2019	15.8	1513 of 1833	17.5%	★☆☆☆☆

Hispanic

Year	Avg score	Statewide rank	California percentile	Rating
2026	36.1	1231 of 1880	34.5%	★★☆☆☆
2025	53.9	851 of 1900	55.2%	★★★☆☆
2024	30.4	1345 of 1902	29.3%	★☆☆☆☆
2023	13.3	1705 of 1917	11.1%	★☆☆☆☆
2022	18.1	1531 of 1861	17.7%	★☆☆☆☆
2019	24.5	1342 of 1814	26.0%	★☆☆☆☆

Low Socio Economic Status

Year	Avg score	Statewide rank	California percentile	Rating
2026	24.9	1508 of 1999	24.6%	★☆☆☆☆
2025	61.7	710 of 2013	64.7%	★★★☆☆
2024	27.1	1487 of 2026	26.6%	★☆☆☆☆
2023	16.2	1703 of 2030	16.1%	★☆☆☆☆
2022	16.4	1636 of 1943	15.8%	★☆☆☆☆
2021	8.3	1067 of 1126	5.2%	☆☆☆☆☆
2019	18.4	1534 of 1937	20.8%	★☆☆☆☆

Male

Year	Avg score	Statewide rank	California percentile	Rating
2026	16.9	1563 of 1932	19.1%	★☆☆☆☆
2025	53.2	856 of 1942	55.9%	★★★☆☆
2024	21.7	1502 of 1948	22.9%	★☆☆☆☆
2023	24.1	1460 of 1963	25.6%	★☆☆☆☆
2022	16.3	1599 of 1916	16.5%	★☆☆☆☆
2021	10.9	1011 of 1122	9.9%	☆☆☆☆☆
2019	21.5	1419 of 1880	24.5%	★☆☆☆☆

White

Year	Avg score	Statewide rank	California percentile	Rating
2019	7.5	1118 of 1222	8.5%	☆☆☆☆☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

Hispanic (2026)35th percentile+8 vs school

English Language Learner (2022)34th percentile+19 vs school

Female (2026)27th percentile~ school

Low Socio Economic Status (2026)25th percentile~ school

Male (2026)19th percentile-7 vs school

White (2019)9th percentile-15 vs school

By subject vs California (2025-2026) ?

English Language Arts/Literacy21%-28 vs state

Science20%-16 vs state

Mathematics15%-23 vs state

★

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Schools Near Delta Keys Charter

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Vaccination Finance All

School													Students/Teachers											Ranking ()				Ranking ()				CAST Science (2026)						Smarter Balanced Assessments English Language Arts/Literacy (2026)								Smarter Balanced Assessments Mathematics (2026)								Vaccination (2024-25)		Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score ()	Statewide Rank ()	State Percentile ()	SchoolDigger Rating ()	Average Standard Score ()	Statewide Rank ()	State Percentile ()	Rank Change from Previous Year	CAST Science 5th Grade	CAST Science 8th Grade	CAST Science 10th Grade	CAST Science 11th Grade	CAST Science 12th Grade	CAST Science All Grades	Smarter Balanced Assessments English Language Arts/Literacy 3rd Grade	Smarter Balanced Assessments English Language Arts/Literacy 4th Grade	Smarter Balanced Assessments English Language Arts/Literacy 5th Grade	Smarter Balanced Assessments English Language Arts/Literacy 6th Grade	Smarter Balanced Assessments English Language Arts/Literacy 7th Grade	Smarter Balanced Assessments English Language Arts/Literacy 8th Grade	Smarter Balanced Assessments English Language Arts/Literacy 11th Grade	Smarter Balanced Assessments English Language Arts/Literacy All Grades	Smarter Balanced Assessments Mathematics 3rd Grade	Smarter Balanced Assessments Mathematics 4th Grade	Smarter Balanced Assessments Mathematics 5th Grade	Smarter Balanced Assessments Mathematics 6th Grade	Smarter Balanced Assessments Mathematics 7th Grade	Smarter Balanced Assessments Mathematics 8th Grade	Smarter Balanced Assessments Mathematics 11th Grade	Smarter Balanced Assessments Mathematics All Grades	Vaccination: Kindergartners with all required immunizations	Vaccination: Exemption rate	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Valley View Charter Prep	Public, Virtual, Charter, Alternative	K-12	31400 S Koster Rd.	Tracy	95815	Sacramento County	Valley View Charter Prep District	Yes	(n/a)	Yes	(n/a)	(866) 992-9033	655	23	28.1	30.1%	282 (43.1%)	40 (6.1%)	118 (18.0%)	184 (28.1%)	10 (1.5%)	6 (0.9%)	15 (2.3%)								(n/a)																							50%	0%
Delta Charter	Public, Charter, Alternative	K-12	31400 South Koster Rd.	Tracy	95304	San Joaquin County	New Jerusalem Elementary	Yes	(n/a)	No	(n/a)	(209) 830-6363	772	49	15.8	52.3%	227 (29.4%)	36 (4.7%)	402 (52.1%)	28 (3.6%)	2 (0.3%)	9 (1.2%)	64 (8.3%)								(n/a)	20.8	23.2		22.5		22.2	25.5	33.3	26.5	40.0	40.0	39.7	36.7	34.9	36.7	40.0	33.3	27.3	24.5	26.3	22.2	29.4	≥ 95%		$30,084	$29,884	$200
Delta Home Charter	Public, Virtual, Charter, Alternative	K-12	31400 South Koster Rd.	Tracy	95304	San Joaquin County	New Jerusalem Elementary	Yes	(n/a)	Yes	(n/a)	(209) 830-6363	265	11	23.1	46.4%	82 (30.9%)	11 (4.2%)	130 (49.1%)	20 (7.5%)	4 (1.5%)	1 (0.4%)	17 (6.4%)								(n/a)	14.3	23.4				20.0	21.4	24.1	21.4	29.0	26.8	21.7		24.4	21.4	27.6	7.1	15.8	14.3	17.0		16.8			$25,213	$25,040	$173
Delta Keys Charter	Public, Virtual, Charter, Alternative	K-12	31400 South Koster Rd.	Tracy	95330	San Joaquin County	New Jerusalem Elementary	Yes	(n/a)	Yes	(n/a)	(209) 830-6363	125	7	17.8	72.8%	17 (13.6%)	9 (7.2%)	80 (64.0%)	9 (7.2%)	0 (0.0%)	0 (0.0%)	10 (8.0%)								(n/a)				20.4	18.2	20.0							21.2	21.2							15.4	15.4			$30,928	$30,736	$192
Delta Charter Online	Public, Virtual, Charter, Alternative	K-12	31400 South Koster Rd.	Tracy	95330	San Joaquin County	New Jerusalem Elementary	Yes	(n/a)	Yes	(n/a)	(209) 830-6363	282	12	23.0	57.4%	74 (26.2%)	16 (5.7%)	143 (50.7%)	27 (9.6%)	1 (0.4%)	2 (0.7%)	19 (6.7%)								(n/a)				30.9		32.9							39.5	39.5							18.5	18.5			$28,809	$28,648	$161
Tracy Independent Study Charter	Public, Virtual, Charter, Alternative	K-12	1904 North Corral Hollow Rd.	Tracy	95376	San Joaquin County	Tracy Joint Unified	Yes	(n/a)	Yes	(n/a)	(209) 830-3200	359	18	19.7	76.6%	64 (17.8%)	35 (9.7%)	168 (46.8%)	61 (17.0%)	0 (0.0%)	7 (1.9%)	24 (6.7%)								(n/a)		21.2		20.4	0.0	21.0				35.3	33.3	32.3	41.1	39.4				5.9	20.8	16.1	20.2	22.5			$28,474	$28,158	$316
California Online Public Schools Northern California	Public, Virtual, Charter, Alternative	K-12	580 North Wilma Ave. Ste. G	Ripon	95366	San Joaquin County	California Online Public Schools Northern California Distri	Yes	(n/a)	Yes	(n/a)	(800) 906-5166	1,507	67	22.6	51.0%	483 (32.1%)	167 (11.1%)	413 (27.4%)	143 (9.5%)	11 (0.7%)	7 (0.5%)	268 (17.8%)								(n/a)																							9%	0%
Hart-Ransom Charter	Public, Virtual, Charter, Alternative	K-12	3920 Shoemake Ave.	Modesto	95358	Stanislaus County	Hart-Ransom Union Elementary	Yes	(n/a)	Yes	(n/a)	(209) 523-0401	0	16	.0	—	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)	40.7	35.7		43.8		42.7	44.4	35.1	29.6	58.5	58.8	55.8	66.0	51.3	47.2	37.8	7.4	47.6	32.4	32.6	34.0	35.3	42%	0%
Stanislaus County West Campus	Public, Alternative	K-12	2215 Blue Gum Ave.	Modesto	95350	Stanislaus County	Stanislaus County Office of Education	No	(n/a)	No	(n/a)	(209) 567-4739	56	6	9.9	94.6%	8 (14.3%)	9 (16.1%)	37 (66.1%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	2 (3.6%)								(n/a)																									$60,658	$56,122	$4,536
Connecting Waters Charter School - Central Valley	Public, Charter, Alternative	K-12	2300 East Briggsmore Ave.	Modesto	95386	Stanislaus County	Connecting Waters Charter School - Central Valley District	Yes	(n/a)	No	(n/a)	(209) 874-1119	776	44	17.7	53.0%	380 (49.0%)	7 (0.9%)	258 (33.2%)	26 (3.4%)	3 (0.4%)	2 (0.3%)	100 (12.9%)								(n/a)	26.9	31.2		37.9		32.4	43.5	45.8	40.4	47.5	40.4	39.3	53.3	44.3	37.7	29.2	17.3	28.8	24.6	32.8	40.0	30.5	31%	0%	$23,284	$23,110	$174

Frequently Asked Questions about Delta Keys Charter

How many students attend Delta Keys Charter?

In the 2024-25 school year, 125 students attended Delta Keys Charter.

What district is Delta Keys Charter in?

New Jerusalem Elementary

What is the racial makeup of Delta Keys Charter?

Students at Delta Keys Charter are 64% Hispanic, 14% White, 8% Two or more races, 7% African American, 7% Asian.

Is Delta Keys Charter a good school?

Delta Keys Charter ranks 1580^th of 2137 California alternative schools. SchoolDigger rates this school 1 star out of 5.

Rate Delta Keys Charter!

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Latest California data All new data »

2013–14 through 2024–25 immunization rates (updated)NewOct 19, 2026

2025–26 attendance data, dropout rates & graduation ratesNewOct 15, 2026

2025–26 CAST, CSA Spanish & Smarter Balanced Assessments scoresNewOct 15, 2026

2024–25 school spending dataJul 1, 2026

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the California Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.