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Altona Middle School

Public Grades 6-8

21^st

SchoolDigger Rank ?

of 476 Colorado Middle Schools

Better than 96% of Colorado middle schools

Summary

Altona Middle School is a grades 6–8 middle school in Longmont, Colorado, serving 715 students in the St. Vrain Valley School District. The school is one of the highest-performing middle schools in the state, ranking #21 out of 469 Colorado middle schools for 2025–2026 — placing it in the top 5% statewide with a 5-star rating. This is not a one-year fluke: Altona has earned 5 stars every year for the past decade, never falling below the 91st percentile. It also outranks every nearby comparison school, including top schools in the Boulder Valley School District such as Manhattan Middle School of the Arts and Academics and Nevin Platt Middle School.

Academically, Altona's CMAS scores are dramatically above district and state averages. In English Language Arts, 74.9% of students are proficient, compared to 44.7% statewide — a 30-point gap. In math, 67.7% are proficient, compared to 37.3% statewide. That math proficiency is Altona's signature strength: it runs nearly 11 points ahead of Mead Middle School, the next-best nearby school, and proficiency actually rises by grade level, from 62.5% in 6th grade to 73.7% in 8th grade. This suggests students genuinely grow their math skills during their three years at the school. Science is also strong at 62.9% proficient, though Manhattan Middle posts a slightly higher science rate.

The school serves its student subgroups well. Gifted and Talented students rank 3rd in the entire state, and female, male, and white students all rank in the 90th-plus percentile. Low-income and Hispanic students also perform above the state median for their subgroups. Chronic absenteeism is 20.1%, better than the district average of 23.1% and the state average of 28.4%, though still affecting about 1 in 5 students. Notably, Altona achieves these results with a student-teacher ratio of 18.5 — higher than some lower-performing nearby schools — pointing to instructional quality and school culture rather than smaller classes. For parents, Altona is an elite, consistent choice: top-tier academics, strong across demographics, and a clear standout in both the St. Vrain Valley and Boulder Valley districts.

715

Students ?

18.5

Student/teacher ratio ?

$17,863

Per pupil spending ?

23.5%

Free/reduced lunch eligible (2024-25) ?

All students in Colorado receive free school meals.

4600 Clover Basin Drive
Longmont, CO 80503-7982

(720) 494-3980

District: St. Vrain Valley School District No. Re1J

Students who attend Altona Middle School usually attend:

High:

Silver Creek High School

Feeder schools for Altona Middle School:

Elementary:	Blue Mountain Elementary
	Eagle Crest Elementary School

Racial breakdown:

White:

69.4%

Hispanic:

15.0%

Asian:

9.9%

See top rated Colorado middle schools

Compare Altona Middle School to nearby middle schools!

At a glance

▬ Ranking trend: Holding steady — 96th percentile in 2016 → 96th in 2026

Strengths

✓Test scores above the Colorado average (70% vs 41% meeting standards)

✓Ranks in the top 4% of Colorado middle schools

✓Among the top-ranked schools in St. Vrain Valley School District No. Re1J

Worth a look

!Some student groups rank well below the school's overall statewide standing

Students meeting standards (2025-2026) ?

This school70%

District avg48%

Colorado avg41%

21^st of 476

Colorado public middle schools ?

Top 4%▬ steady since 2016

See the entire ranking list of Colorado Middle Schools →

★★★★★

SchoolDigger rating ?

1^st of 8Middle Schools in the St. Vrain Valley School District No. Re1J

23^rd of 114St. Vrain Valley School District No. Re1J among Colorado districts

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	Colorado percentile	Rating
2026	94.3	21 of 476	95.6%	★★★★★
2025	92.5	26 of 469	94.5%	★★★★★
2024	93.6	24 of 485	95.1%	★★★★★
2023	93.8	25 of 480	94.8%	★★★★★
2022	88.7	38 of 448	91.5%	★★★★★
2021	88.1	32 of 369	91.3%	★★★★★
2019	93.1	21 of 458	95.4%	★★★★★
2018	94.0	17 of 418	95.9%	★★★★★
2017	94.0	13 of 424	96.9%	★★★★★
2016	94.5	18 of 400	95.5%	★★★★★
2015	95.9	13 of 436	97.0%	★★★★★
2014	90.9	26 of 461	94.4%	★★★★★
2013	89.5	31 of 454	93.2%	★★★★★
2012	88.2	32 of 425	92.5%	★★★★★
2011	89.9	26 of 422	93.8%	★★★★★
2010	88.6	28 of 409	93.2%	★★★★★
2009	84.7	44 of 377	88.3%	★★★★☆
2008	90.0	21 of 362	94.2%	★★★★★
2007	87.5	33 of 360	90.8%	★★★★★

Asian

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	74.1	6 of 27	77.8%	★★★★☆
2025	70.3	9 of 26	65.4%	★★★★☆
2023	74.6	4 of 18	77.8%	★★★★☆
2019	78.4	4 of 25	84.0%	★★★★☆
2018	91.3	1 of 16	93.8%	★★★★★

Female

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	91.8	19 of 368	94.8%	★★★★★
2025	89.7	25 of 347	92.8%	★★★★★
2024	87.2	36 of 350	89.7%	★★★★☆
2023	90.4	27 of 363	92.6%	★★★★★
2022	79.4	52 of 326	84.0%	★★★★☆
2021	84.0	27 of 254	89.4%	★★★★☆
2019	92.9	17 of 352	95.2%	★★★★★
2018	92.4	16 of 315	94.9%	★★★★★

Gifted and Talented

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	84.7	3 of 154	98.1%	★★★★★
2025	77.1	10 of 132	92.4%	★★★★★
2024	76.8	13 of 126	89.7%	★★★★★
2023	67.5	46 of 125	63.2%	★★★☆☆
2022	68.0	30 of 93	67.7%	★★★★☆
2019	72.8	23 of 134	82.8%	★★★★☆
2018	73.6	18 of 121	85.1%	★★★★☆

Hispanic

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	68.0	45 of 208	78.4%	★★★★☆
2024	74.8	30 of 199	84.9%	★★★★☆
2023	82.6	21 of 198	89.4%	★★★★☆
2022	75.4	26 of 169	84.6%	★★★★☆
2021	52.8	34 of 83	59.0%	★★★☆☆
2019	78.4	27 of 220	87.7%	★★★★☆
2018	79.6	23 of 165	86.1%	★★★★☆

Low Socio Economic Status

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	75.5	37 of 231	84.0%	★★★★☆
2025	84.7	14 of 241	94.2%	★★★★★
2024	80.8	24 of 244	90.2%	★★★★★
2023	90.4	8 of 241	96.7%	★★★★★
2022	65.0	39 of 197	80.2%	★★★★☆
2021	57.5	32 of 114	71.9%	★★★★☆
2019	75.5	29 of 240	87.9%	★★★★☆
2018	85.0	14 of 222	93.7%	★★★★★

Male

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	92.2	23 of 372	93.8%	★★★★★
2025	90.3	28 of 352	92.0%	★★★★★
2024	94.3	17 of 357	95.2%	★★★★★
2023	92.2	22 of 356	93.8%	★★★★★
2022	89.2	27 of 328	91.8%	★★★★★
2021	83.2	30 of 249	88.0%	★★★★☆
2019	89.5	31 of 343	91.0%	★★★★★
2018	91.4	19 of 317	94.0%	★★★★★

White

Year	Avg score	Statewide rank	Colorado percentile	Rating
2026	90.0	18 of 278	93.5%	★★★★★
2025	83.5	32 of 275	88.4%	★★★★☆
2024	86.9	21 of 273	92.3%	★★★★★
2023	87.3	24 of 286	91.6%	★★★★★
2022	78.8	41 of 265	84.5%	★★★★☆
2021	82.3	25 of 203	87.7%	★★★★☆
2019	86.9	23 of 283	91.9%	★★★★★
2018	90.7	18 of 199	91.0%	★★★★★

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)

Gifted and Talented (2026)98th percentile~ school

Female (2026)95th percentile~ school

Male (2026)94th percentile~ school

White (2026)94th percentile~ school

Low Socio Economic Status (2026)84th percentile-12 vs school

Hispanic (2026)78th percentile-17 vs school

Asian (2026)78th percentile-18 vs school

By subject vs Colorado (2025-2026) ?

English Language Arts75%+30 vs state

Math68%+30 vs state

Science63%+27 vs state

★

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Schools Near Altona Middle School

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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 Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				CMAS English Language Arts (2026)					CMAS Math (2026)					CMAS Science (2026)		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 (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	CMAS English Language Arts 5th Grade	CMAS English Language Arts 6th Grade	CMAS English Language Arts 7th Grade	CMAS English Language Arts 8th Grade	CMAS English Language Arts All Grades	CMAS Math 5th Grade	CMAS Math 6th Grade	CMAS Math 7th Grade	CMAS Math 8th Grade	CMAS Math All Grades	CMAS Science 5th Grade	CMAS Science 8th Grade	Total
Altona Middle School	Public	6-8	4600 Clover Basin Drive	Longmont	80503	Boulder County	St. Vrain Valley School District No. Re1J	No	No	No	No	(720) 494-3980	715	39	18.5	23.5%	496 (69.4%)	5 (0.7%)	107 (15.0%)	71 (9.9%)	0 (0.0%)	0 (0.0%)	36 (5.0%)	94.3	21^st of 476 public middle schools	95.6%		92.5	26^th of 469 public middle schools	94.5%	5		73.2	78.7	72.3	74.9		62.5	68.1	73.7	67.7		62.9	$17,863
Sunset Middle School	Public	6-8	1300 S. Sunset	Longmont	80501	Boulder County	St. Vrain Valley School District No. Re1J	No	No	No	No	(303) 776-3963	316	25	12.5	58.5%	126 (39.9%)	0 (0.0%)	173 (54.7%)	5 (1.6%)	2 (0.6%)	0 (0.0%)	10 (3.2%)	34.9	278^th of 476 public middle schools	41.6%		40.5	238^th of 469 public middle schools	49.3%	40		37.6	31.6	28.8	33.2		31.8	23.5	30.6	28.5		27.6	$22,643
Westview Middle School	Public	6-8	1651 Airport Road	Longmont	80503	Boulder County	St. Vrain Valley School District No. Re1J	No	No	No	No	(303) 772-3134	621	34	18.4	36.1%	439 (70.7%)	6 (1.0%)	145 (23.3%)	8 (1.3%)	3 (0.5%)	0 (0.0%)	20 (3.2%)	80.1	79^th of 476 public middle schools	83.4%		73.5	107^th of 469 public middle schools	77.2%	28		52.2	68.9	60.4	60.3		47.0	49.7	60.5	51.3		55.5	$17,752
Longs Peak Middle School	Public	5-8	1500 14th Avenue	Longmont	80501	Boulder County	St. Vrain Valley School District No. Re1J	No	No	No	Yes	(303) 776-5611	381	31	12.4	80.3%	93 (24.4%)	4 (1.0%)	275 (72.2%)	2 (0.5%)	1 (0.3%)	0 (0.0%)	6 (1.6%)	13.8	431^st of 476 public middle schools	9.5%		17.3	391^st of 469 public middle schools	16.6%	40	26.2	14.1	26.5	18.1	20.6	8.1	10.6	16.7	16.7	13.4	15.0	12.5	$21,869
Trail Ridge Middle School	Public	6-8	1000 Button Rock Drive	Longmont	80504	Weld County	St. Vrain Valley School District No. Re1J	No	No	No	No	(720) 494-3820	435	30	14.7	59.8%	161 (37.0%)	3 (0.7%)	251 (57.7%)	8 (1.8%)	1 (0.2%)	0 (0.0%)	11 (2.5%)	33.5	287^th of 476 public middle schools	39.7%		37.1	263^rd of 469 public middle schools	43.9%	24		30.0	37.6	30.5	32.8		26.1	29.4	29.1	28.1		25.3	$19,714
Erie Middle School	Public	6-8	650 Main Street	Erie	80516	Boulder County	St. Vrain Valley School District No. Re1J	No	No	No	No	(303) 828-3391	762	38	20.1	15.5%	562 (73.8%)	10 (1.3%)	114 (15.0%)	41 (5.4%)	1 (0.1%)	0 (0.0%)	34 (4.5%)	77.3	99^th of 476 public middle schools	79.2%		81.8	69^th of 469 public middle schools	85.3%	30		53.6	61.6	46.4	54.1		47.8	61.9	56.2	55.2		51.4	$16,539
Centennial Middle School	Public	6-8	2205 Norwood Avenue	Boulder	80304	Boulder County	Boulder Valley School District No. Re2	No	No	No	No	(720) 561-5441	598	31	19.3	33.1%	379 (63.4%)	7 (1.2%)	172 (28.8%)	11 (1.8%)	1 (0.2%)	0 (0.0%)	26 (4.3%)	79.8	84^th of 476 public middle schools	82.4%		78.4	85^th of 469 public middle schools	81.9%	1		60.7	51.9	69.6	60.6		43.3	45.2	63.8	50.8		62.2	$18,969
Nevin Platt Middle School	Public	6-8	6096 Baseline Road	Boulder	80303	Boulder County	Boulder Valley School District No. Re2	No	No	No	No	(720) 561-5536	483	29	16.8	14.7%	389 (80.5%)	4 (0.8%)	47 (9.7%)	4 (0.8%)	1 (0.2%)	0 (0.0%)	36 (7.5%)	84.3	59^th of 476 public middle schools	87.6%		80.9	71^st of 469 public middle schools	84.9%	12		57.2	68.9	69.7	64.9		45.3	50.9	64.1	53.4		61.5	$21,532
Mead Middle School	Public	6-8	620 Welker Ave.	Mead	80542	Weld County	St. Vrain Valley School District No. Re1J	No	No	No	No	(970) 535-4446	571	32	17.8	27.0%	406 (71.1%)	4 (0.7%)	132 (23.1%)	10 (1.8%)	2 (0.4%)	0 (0.0%)	17 (3.0%)	83.7	63^rd of 476 public middle schools	86.8%		80.4	74^th of 469 public middle schools	84.2%	11		54.6	64.7	65.7	61.1		50.0	53.2	68.6	56.5		57.9	$18,817
Casey Middle School	Public	6-8	1301 High Street	Boulder	80304	Boulder County	Boulder Valley School District No. Re2	No	No	No	No	(720) 561-2700	363	29	12.6	65.0%	138 (38.0%)	3 (0.8%)	199 (54.8%)	8 (2.2%)	0 (0.0%)	1 (0.3%)	14 (3.9%)	43.5	223^rd of 476 public middle schools	53.2%		33.1	291^st of 469 public middle schools	38.0%	68		723.0	729.0	41.7	30.4		713.0	724.0	34.2	22.2		29.6	$23,458

Frequently Asked Questions about Altona Middle School

What district is Altona Middle School in?

St. Vrain Valley School District No. Re1J

What is the racial makeup of Altona Middle School?

Students at Altona Middle School are 69% White, 15% Hispanic, 10% Asian, 5% Two or more races.

What high school do graduates of Altona Middle School attend?

Students who attend Altona Middle School usually go on to attend Silver Creek High School

How many students attend Altona Middle School?

In the 2024-25 school year, 715 students attended Altona Middle School.

Is Altona Middle School a good school?

Yes! Altona Middle School is one of the best middle schools in the state. It ranks 21^st of 476 Colorado middle schools.

Rate Altona Middle School!

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Latest Colorado data All new data »

2025–26 attendance dataOct 6, 2026

2025–26 CMAS, PSAT10, PSAT9 & SAT test scoresAug 19, 2026

2024–25 school spending dataJun 13, 2026

2024–25 dropout rates & graduation ratesJan 13, 2026

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