Colorado public school districts ranked by the lowest enrollment-weighted state-assessment proficiency. Counties need at least 3 schools and 1,000 students to qualify.
| # | County | State | % Proficient |
|---|---|---|---|
| 1 | Kit Carson County | CO | 22.5% |
| 2 | Pueblo County | CO | 25.0% |
| 3 | Adams County | CO | 25.5% |
| 4 | Garfield County | CO | 25.7% |
| 5 | Rio Grande County | CO | 26.8% |
| 6 | Prowers County | CO | 27.2% |
| 7 | Moffat County | CO | 27.8% |
| 8 | Las Animas County | CO | 28.1% |
| 9 | Montrose County | CO | 30.3% |
| 10 | Fremont County | CO | 31.0% |
| 11 | Weld County | CO | 31.8% |
| 12 | Denver County | CO | 32.0% |
| 13 | Archuleta County | CO | 33.2% |
| 14 | Grand County | CO | 33.6% |
| 15 | Eagle County | CO | 33.8% |
| 16 | Arapahoe County | CO | 34.3% |
| 17 | Delta County | CO | 34.6% |
| 18 | Mesa County | CO | 36.0% |
| 19 | Yuma County | CO | 36.7% |
| 20 | El Paso County | CO | 38.6% |
| 21 | Summit County | CO | 38.6% |
| 22 | Gunnison County | CO | 39.4% |
| 23 | La Plata County | CO | 39.8% |
| 24 | Elbert County | CO | 40.6% |
| 25 | Teller County | CO | 41.0% |
| 26 | Park County | CO | 42.6% |
| 27 | Conejos County | CO | 43.7% |
| 28 | Jefferson County | CO | 43.7% |
| 29 | Rio Blanco County | CO | 43.8% |
| 30 | Larimer County | CO | 45.4% |
| 31 | Broomfield County | CO | 51.3% |
| 32 | Routt County | CO | 52.9% |
| 33 | Boulder County | CO | 53.4% |
| 34 | Douglas County | CO | 53.8% |