Frost dates for Willsboro 1 N, NY
At Willsboro 1 N, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 14, for a typical growing season of 165 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zones 4b to 5b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 165 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 | May 1 | May 12 | May 26 |
| 32°F | Apr 20 | May 2 | May 16 |
| 28°F | Apr 9 | Apr 21 | May 3 |
| 24°F | Mar 30 | Apr 9 | Apr 22 |
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 21 | Oct 4 | Oct 16 |
| 32°F | Oct 2 | Oct 14 | Nov 1 |
| 28°F | Oct 11 | Oct 28 | Nov 10 |
| 24°F | Oct 26 | Nov 8 | 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 | 125 days | 144 days | 162 days |
| 32°F | 146 days | 165 days | 185 days |
| 28°F | 169 days | 189 days | 208 days |
| 24°F | 193 days | 211 days | 229 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 |
|---|---|---|---|
| 12996 | 5a | -20 to -15°F | 6 km |
| 05482 | 5b | -15 to -10°F | 11 km |
| 12936 | 5a | -20 to -15°F | 11 km |
| 12944 | 5a | -20 to -15°F | 13 km |
| 05445 | 5a | -20 to -15°F | 15 km |
| 12950 | 5a | -20 to -15°F | 17 km |
| 12932 | 4b | -25 to -20°F | 26 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 USC00309495, at 44.3842, -73.3819, elevation 55 m (180 ft).
- Data quality: Representative (10+ years), 20 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
- Peru 2 WSW (25 km)
- Plattsburgh Intl Airport (30 km)
- Dannemora (46 km)
- Lake Placid 2 S (49 km)
- Chazy (55 km)
- Ray Brook (58 km)
- Saranac Regional Airport (66 km)
- Ellenburg Depot (68 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.