| Index | Hardin | Montana | National |
| Average Test Scores | 16% | 45% | 48% |
| Student/Teacher ratio | 12:1 | 14:1 | 16:1 |
| Total public schools | 7 | 408 | 79,221 |
| Total private schools | 1 | 77 | 24,874 |
| Total post-secondary schools | n/a | 32 | 7,963 |
| Index | Hardin | Montana | National |
| Completed 8th grade | 85.3% | 89.4% | 84.3% |
| Completed high school | 85.0% | 88.2% | 83.0% |
| Completed some college | 54.9% | 63.1% | 59.4% |
| Completed associate degree | 32.1% | 38.6% | 38.5% |
| Completed bachelors | 18.7% | 29.9% | 30.3% |
| Completed masters | 7.6% | 9.8% | 11.5% |
| Completed professional degree | 2.2% | 3.0% | 3.3% |
| Completed doctorate | 1.6% | 1.2% | 1.3% |
There are a total of 7 public schools, 1 private schools and n/a post-secondary schools in Hardin. Using the proficiency score averages, the average test scores for Hardin, MT schools is 16%. The average student to teacher ratio is 12:1. In Hardin, MT, an average of 85.3% of students have completed 8th grade and an average of 85.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Crow Agency, MT | 1,972 | 5% | 89.6% |
| Hardin, MT | 3,777 | 16% | 66.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Rochester, IL | 3,778 | 36% | 24.7% |
| Alturas, FL | 3,778 | 55% | 13.5% |
| Cozad, NE | 3,776 | 40% | 16.0% |
| Tiffin, IA | 3,779 | 77% | 61.1% |
| Mojave, CA | 3,780 | 14% | 71.9% |
| Hardin, MT | 3,777 | 16% | 66.0% |
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