Frost dates for Shirley Brookhaven Airport, NY
At Shirley Brookhaven Airport, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 28, for a typical growing season of 193 days. For a 90% chance that the last frost has passed, wait until May 1. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 1Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 193 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 18 | Apr 30 | May 15 |
| 32°F | Apr 4 | Apr 18 | May 1 |
| 28°F | Mar 21 | Apr 3 | Apr 17 |
| 24°F | Mar 7 | Mar 22 | Apr 4 |
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 4 | Oct 17 | Nov 1 |
| 32°F | Oct 13 | Oct 28 | Nov 11 |
| 28°F | Oct 24 | Nov 9 | Nov 25 |
| 24°F | Nov 5 | Nov 22 | Dec 7 |
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 | 148 days | 168 days | 188 days |
| 32°F | 172 days | 193 days | 211 days |
| 28°F | 197 days | 218 days | 239 days |
| 24°F | 221 days | 245 days | 266 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 |
|---|---|---|---|
| 11967 | 7a | 0 to 5°F | 2 km |
| 11950 | 7a | 0 to 5°F | 3 km |
| 11955 | 7a | 0 to 5°F | 4 km |
| 11980 | 7a | 0 to 5°F | 5 km |
| 11719 | 7a | 0 to 5°F | 6 km |
| 11934 | 7a | 0 to 5°F | 7 km |
| 11951 | 7a | 0 to 5°F | 7 km |
| 11713 | 7a | 0 to 5°F | 8 km |
| 11940 | 7a | 0 to 5°F | 10 km |
| 11763 | 7a | 0 to 5°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 USW00054790, at 40.8217, -72.8689, elevation 25 m (82 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 104.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Upton COOP - Nwsfo New York (5 km)
- Baiting Hollow (17 km)
- Mount Sinai (18 km)
- Islip Li Macarthur Airport (20 km)
- Westhamptn Gabreski Airport (20 km)
- Riverhead Rsch Farm (20 km)
- Molloy Cercom (22 km)
- Setauket Strong (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.