Frost dates for Setauket Strong, NY
At Setauket Strong, the median last spring frost (32°F) is Apr 15 and the median first fall frost is Nov 10, for a typical growing season of 208 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 15Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 208 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 15 | Apr 30 | May 15 |
| 32°F | Apr 1 | Apr 15 | May 4 |
| 28°F | Mar 14 | Mar 31 | Apr 19 |
| 24°F | Mar 2 | Mar 18 | Apr 3 |
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 | Oct 14 | Oct 29 | Nov 10 |
| 32°F | Oct 27 | Nov 10 | Nov 24 |
| 28°F | Nov 9 | Nov 21 | Dec 5 |
| 24°F | Nov 18 | Dec 3 | Dec 21 |
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 | 160 days | 180 days | 200 days |
| 32°F | 185 days | 208 days | 230 days |
| 28°F | 213 days | 235 days | 257 days |
| 24°F | 239 days | 259 days | 283 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 |
|---|---|---|---|
| 11733 | 7b | 5 to 10°F | 2 km |
| 11777 | 7b | 5 to 10°F | 3 km |
| 11790 | 7b | 5 to 10°F | 6 km |
| 11780 | 7b | 5 to 10°F | 8 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 USC00307633, at 40.9586, -73.1047, elevation 12 m (40 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 96.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Sinai (8 km)
- Islip Li Macarthur Airport (18 km)
- Upton COOP - Nwsfo New York (23 km)
- Centerport (24 km)
- Shirley Brookhaven Airport (25 km)
- Molloy Cercom (26 km)
- Baiting Hollow (31 km)
- Riverhead Rsch Farm (33 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.