Frost dates for Bridgeport Sikorsky Mem Airport, CT
At Bridgeport Sikorsky Mem Airport, the median last spring frost (32°F) is Apr 5 and the median first fall frost is Nov 6, for a typical growing season of 216 days. For a 90% chance that the last frost has passed, wait until Apr 17. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 5Last spring frost (median)50% chance of 32°F after this date
- Apr 17Safer planting date10% chance of 32°F after this date
- Nov 6First fall frost (median)50% chance of 32°F by this date
- 216 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 6 | Apr 16 | Apr 29 |
| 32°F | Mar 25 | Apr 5 | Apr 17 |
| 28°F | Mar 11 | Mar 26 | Apr 6 |
| 24°F | Feb 28 | Mar 15 | Mar 30 |
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 11 | Oct 26 | Nov 8 |
| 32°F | Oct 25 | Nov 6 | Nov 20 |
| 28°F | Nov 6 | Nov 19 | Dec 5 |
| 24°F | Nov 15 | Dec 1 | Dec 17 |
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 | 175 days | 194 days | 210 days |
| 32°F | 198 days | 216 days | 234 days |
| 28°F | 221 days | 238 days | 259 days |
| 24°F | 240 days | 259 days | 281 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 |
|---|---|---|---|
| 06615 | 7a | 0 to 5°F | 1 km |
| 06607 | 7a | 0 to 5°F | 4 km |
| 06608 | 7a | 0 to 5°F | 5 km |
| 06610 | 7a | 0 to 5°F | 6 km |
| 06604 | 7a | 0 to 5°F | 7 km |
| 06605 | 7a | 0 to 5°F | 7 km |
| 06614 | 7a | 0 to 5°F | 8 km |
| 06606 | 7a | 0 to 5°F | 9 km |
| 06460 | 7a | 0 to 5°F | 10 km |
| 06461 | 7a | 0 to 5°F | 10 km |
| 06825 | 7a | 0 to 5°F | 10 km |
| 06824 | 7a | 0 to 5°F | 13 km |
| 06890 | 7a | 0 to 5°F | 13 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 USW00094702, at 41.1583, -73.1289, elevation 2 m (5 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 92.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ansonia 1 NE (21 km)
- New Haven Tweed Airport (23 km)
- Mount Carmel (34 km)
- Stamford 5 N (35 km)
- Danbury (36 km)
- Danbury Muni Airport (38 km)
- Meriden Markham Muni Airport (46 km)
- Burlington (73 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.