Frost dates for Burlington Intl Airport, VT
At Burlington Intl Airport, the median last spring frost (32°F) is Apr 29 and the median first fall frost is Oct 15, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- Apr 29Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 15First fall frost (median)50% chance of 32°F by this date
- 169 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 27 | May 8 | May 23 |
| 32°F | Apr 17 | Apr 29 | May 11 |
| 28°F | Apr 5 | Apr 18 | Apr 30 |
| 24°F | Mar 27 | Apr 7 | Apr 18 |
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 4 | Oct 19 |
| 32°F | Oct 2 | Oct 15 | Nov 1 |
| 28°F | Oct 12 | Oct 28 | Nov 12 |
| 24°F | Oct 26 | Nov 9 | Nov 23 |
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 | 129 days | 147 days | 166 days |
| 32°F | 149 days | 169 days | 187 days |
| 28°F | 173 days | 193 days | 211 days |
| 24°F | 196 days | 215 days | 234 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 |
|---|---|---|---|
| 05403 | 5a | -20 to -15°F | 3 km |
| 05439 | 5a | -20 to -15°F | 3 km |
| 05405 | 5a | -20 to -15°F | 4 km |
| 05404 | 5a | -20 to -15°F | 4 km |
| 05401 | 5b | -15 to -10°F | 5 km |
| 05495 | 5a | -20 to -15°F | 6 km |
| 05408 | 5b | -15 to -10°F | 11 km |
| 05477 | 5a | -20 to -15°F | 17 km |
| 05461 | 5a | -20 to -15°F | 17 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 USW00014742, at 44.4683, -73.1500, elevation 101 m (330 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 145.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Essex Junction 1 N (5 km)
- S Hero (21 km)
- Mount Mansfield (27 km)
- Vergennes (34 km)
- Morrisville 4 SSW (42 km)
- Johnson 2 N (43 km)
- Waitsfield 2 SE (43 km)
- Morrisville Stowe State Airport (43 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.