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Vermont frost dates
Across the 6Vermont weather stations below, the average last spring frost ranges from Apr 29 in Burlington to May 20 in Morrisville Stowe. The statewide middle is about May 12 for the last spring frost and Oct 3 for the first fall frost. Burlington has the longest growing season, about 169 days. Hardiness zones in these places: 4b, 5a, 5b.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Burlington | 5a | Apr 29 | May 11 | Oct 15 | 169 |
| Saint Johnsbury | 4b | May 10 | May 23 | Oct 3 | 146 |
| Bennington Morse | 5b | May 11 | May 28 | Oct 2 | 144 |
| Springfield Hartness | 5b | May 13 | May 28 | Oct 3 | 143 |
| Barre Montpelier | 4b | May 16 | May 30 | Sep 29 | 136 |
| Morrisville Stowe | 4b | May 20 | Jun 4 | Sep 28 | 131 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Vermont
Using the statewide middle dates (last frost May 12, first frost Oct 3). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Vermont |
|---|---|
| Tomatoes | May 19 – Jun 2 |
| Peas | Mar 31 – Apr 21; fall: Jul 11 – Aug 1 |
| Potatoes | Apr 14 – May 5 |
| Green beans | May 19 – Jun 2; fall: Jul 18 – Aug 1 |
| Garlic | Oct 3 – Oct 31 |
| Tulips | Sep 19 – Oct 31 |