Frost dates for Upton COOP - Nwsfo New York, NY
At Upton COOP - Nwsfo New York, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 24, for a typical growing season of 184 days. For a 90% chance that the last frost has passed, wait until May 6. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 6Safer planting date10% chance of 32°F after this date
- Oct 24First fall frost (median)50% chance of 32°F by this date
- 184 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 22 | May 3 | May 17 |
| 32°F | Apr 7 | Apr 21 | May 6 |
| 28°F | Mar 26 | Apr 7 | Apr 20 |
| 24°F | Mar 11 | Mar 27 | Apr 7 |
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 30 | Oct 11 | Oct 27 |
| 32°F | Oct 9 | Oct 24 | Nov 6 |
| 28°F | Oct 22 | Nov 3 | Nov 18 |
| 24°F | Nov 2 | Nov 17 | Dec 4 |
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 | 142 days | 160 days | 179 days |
| 32°F | 164 days | 184 days | 203 days |
| 28°F | 190 days | 210 days | 229 days |
| 24°F | 214 days | 234 days | 257 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 |
|---|---|---|---|
| 11973 | 7a | 0 to 5°F | 2 km |
| 11961 | 7a | 0 to 5°F | 5 km |
| 11949 | 7a | 0 to 5°F | 5 km |
| 11786 | 7b | 5 to 10°F | 10 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 USC00308721, at 40.8656, -72.8642, elevation 24 m (80 ft).
- Data quality: Estimated from nearby stations (2+ years), 8 years of freeze data.
- Average days per year at or below 32°F: 118.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Shirley Brookhaven Airport (5 km)
- Baiting Hollow (13 km)
- Mount Sinai (15 km)
- Riverhead Rsch Farm (16 km)
- Westhamptn Gabreski Airport (20 km)
- Islip Li Macarthur Airport (22 km)
- Setauket Strong (23 km)
- Molloy Cercom (25 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.