allk12 · Rankings · Lowest proficiency · Colorado · Boulder County

The lowest-performing public schools by test proficiency in Boulder County, Colorado

70 public schools in Boulder County, Colorado appear in this ranking of the lowest-performing public schools by test proficiency, ranked by the lowest composite state-assessment proficiency. Skyline High School leads the list at 13.2%, against a median of 54.4% across the ranked schools.

The table below is sortable and filterable, and the full list downloads as a CSV. Figures come from federal NCES enrollment data and, where applicable, state assessment results for 2024-25.

Schools ranked

Boulder County, Colorado

Best % Proficient

13.2%

Median % Proficient

54.4%

LOWEST PROFICIENCY · BOULDER COUNTY, COLORADO

#	School	City	District	Level	% FRL	Students	% Proficient
1	Skyline High School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	High	64.1%	1,082	13.2%
2	Timberline PK-8	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	83.6%	762	15.8%
3	Longs Peak Middle School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Middle	80.3%	381	17.8%
4	Northridge Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	77.4%	318	18.6%
5	Rocky Mountain Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	82.9%	315	20.8%
6	Mountain View Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	76.6%	321	21.1%
7	Columbine Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	89.2%	231	24.7%
8	Alicia Sanchez International School	LAFAYETTE, CO	Boulder Valley School District No. Re2	Elementary	78.5%	321	25.6%
9	Indian Peaks Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	84.6%	214	28.0%
10	Columbine Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	73.2%	369	29.3%
11	Casey Middle School	BOULDER, CO	Boulder Valley School District No. Re2	Middle	65.0%	363	29.8%
12	Trail Ridge Middle School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Middle	59.8%	435	29.8%
13	Sunset Middle School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Middle	58.5%	316	30.8%
14	Silver Creek High School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	High	27.0%	1,208	33.9%
15	Burlington Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	61.3%	320	34.5%
16	Longmont High School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	High	47.9%	1,268	35.5%
17	Sanborn Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	62.7%	209	37.5%
18	Alpine Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	55.9%	388	38.3%
19	Angevine Middle School	LAFAYETTE, CO	Boulder Valley School District No. Re2	Middle	49.6%	619	38.7%
20	Whittier Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	42.0%	269	40.3%
21	Nederland Middle-Senior High School	NEDERLAND, CO	Boulder Valley School District No. Re2	High	38.3%	235	43.1%
22	University Hill Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	61.5%	405	44.5%
23	Ryan Elementary School	LAFAYETTE, CO	Boulder Valley School District No. Re2	Elementary	34.9%	436	46.1%
24	Eagle Crest Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	44.9%	421	48.8%
25	Pioneer Bilingual Elementary School	LAFAYETTE, CO	Boulder Valley School District No. Re2	Elementary	46.2%	439	48.9%
26	Westview Middle School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Middle	36.1%	621	50.5%
27	Niwot High School	NIWOT, CO	St. Vrain Valley School District No. Re1J	High	25.6%	1,509	51.0%
28	Longmont Estates Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	42.2%	365	51.1%
29	Flagstaff Charter Academy	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	19.4%	725	52.2%
30	New Vista High School	BOULDER, CO	Boulder Valley School District No. Re2	High	26.3%	327	52.4%
31	Centennial Middle School	BOULDER, CO	Boulder Valley School District No. Re2	Middle	33.1%	598	52.5%
32	Monarch K-8 School	LOUISVILLE, CO	Boulder Valley School District No. Re2	Elementary	23.9%	698	52.6%
33	Nevin Platt Middle School	BOULDER, CO	Boulder Valley School District No. Re2	Middle	14.7%	483	53.7%
34	Red Hawk Elementary	ERIE, CO	St. Vrain Valley School District No. Re1J	Elementary	12.6%	588	53.8%
35	Monarch High School	LOUISVILLE, CO	Boulder Valley School District No. Re2	High	16.2%	1,431	54.4%
36	Manhattan Middle School of the Arts and Academics	BOULDER, CO	Boulder Valley School District No. Re2	Middle	31.1%	482	54.5%
37	Crest View Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	35.6%	390	54.7%
38	Community Montessori School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	29.2%	277	56.0%
39	Boulder High School	BOULDER, CO	Boulder Valley School District No. Re2	High	34.5%	1,939	58.7%
40	Lafayette Elementary School	LAFAYETTE, CO	Boulder Valley School District No. Re2	Elementary	20.1%	497	58.8%
41	Centaurus High School	LAFAYETTE, CO	Boulder Valley School District No. Re2	High	30.8%	1,557	59.8%
42	Nederland Elementary School	NEDERLAND, CO	Boulder Valley School District No. Re2	Elementary	33.2%	196	59.8%
43	Coal Creek Elementary School	LOUISVILLE, CO	Boulder Valley School District No. Re2	Elementary	18.5%	313	61.1%
44	Fall River Elementary School	LONGMONT, CO	St. Vrain Valley School District No. Re1J	Elementary	30.2%	520	61.5%
45	Louisville Middle School	LOUISVILLE, CO	Boulder Valley School District No. Re2	Middle	18.5%	626	62.9%
46	Louisville Elementary School	LOUISVILLE, CO	Boulder Valley School District No. Re2	Elementary	23.6%	449	63.4%
47	Meadowlark School	ERIE, CO	Boulder Valley School District No. Re2	Elementary	10.3%	747	64.4%
48	Heatherwood Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	18.7%	252	64.8%
49	Lyons Middle/Senior High School	LYONS, CO	St. Vrain Valley School District No. Re1J	High	26.2%	344	65.0%
50	Flatirons Elementary School	BOULDER, CO	Boulder Valley School District No. Re2	Elementary	18.4%	163	65.6%

Page 1 of 2 · top 70 of 70 ranked. NCES + state assessment data, 2024-25.↓ Download full CSV

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DATA NOTICE

allk12 is independent and not affiliated with, endorsed by, or sponsored by NCES, the US Census Bureau, any state education agency or assessment program, or any other government agency. Source data is compiled from public records and provided "as is," without warranty of accuracy or completeness. You rely on it, and any analysis derived from it, at your own risk. See the full disclaimer.