Hartford, CT Frost Dates
The last spring frost in Hartford usually comes around April 21 and the first fall frost around October 16.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | April 21 | October 16 |
| Hard freeze, 28°F | April 7 | October 29 |
Growing season: about 177 days.
Frequently asked questions
When is the last frost in Hartford, CT?
The median date of the last spring frost (32°F) is April 21. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past April 21 lowers the risk for tender plants.
When is the first frost in Hartford?
The median date of the first fall frost (32°F) is October 16, and a hard freeze (28°F) usually follows around October 29.
How long is the growing season in Hartford?
About 177 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00014740. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.