Frost dates for Vergennes, VT
At Vergennes, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 17, for a typical growing season of 168 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 168 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 29 | May 9 | May 22 |
| 32°F | Apr 20 | Apr 30 | May 11 |
| 28°F | Apr 8 | Apr 21 | May 2 |
| 24°F | Mar 31 | Apr 9 | Apr 21 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 23 | Oct 5 | Oct 18 |
| 32°F | Oct 2 | Oct 17 | Nov 1 |
| 28°F | Oct 14 | Oct 30 | Nov 12 |
| 24°F | Oct 27 | Nov 9 | Nov 24 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 128 days | 146 days | 163 days |
| 32°F | 149 days | 168 days | 187 days |
| 28°F | 173 days | 192 days | 209 days |
| 24°F | 194 days | 213 days | 230 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 05456 | 5a | -20 to -15°F | 5 km |
| 05491 | 5a | -20 to -15°F | 9 km |
| 05473 | 5a | -20 to -15°F | 9 km |
| 05472 | 5a | -20 to -15°F | 10 km |
| 12993 | 5a | -20 to -15°F | 19 km |
| 12956 | 5a | -20 to -15°F | 20 km |
| 12974 | 5a | -20 to -15°F | 21 km |
| 12961 | 4b | -25 to -20°F | 30 km |
| 12998 | 4b | -25 to -20°F | 30 km |
| 12964 | 4b | -25 to -20°F | 31 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00438597, at 44.1719, -73.2472, elevation 60 m (196 ft).
- Data quality: Estimated from nearby stations (2+ years), 7 years of freeze data.
- Average days per year at or below 32°F: 152.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cornwall (24 km)
- S Lincoln (24 km)
- Salisbury 2 N (30 km)
- Burlington Intl Airport (34 km)
- Waitsfield 2 SE (36 km)
- Essex Junction 1 N (39 km)
- Northfield (47 km)
- Rochester (50 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.