Frost dates for Stamford 5 N, CT
At Stamford 5 N, the median last spring frost (32°F) is Apr 17 and the median first fall frost is Oct 23, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zones 6b to 7b.
- Apr 17Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 188 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 16 | Apr 30 | May 16 |
| 32°F | Apr 3 | Apr 17 | May 2 |
| 28°F | Mar 20 | Apr 3 | Apr 19 |
| 24°F | Mar 9 | Mar 24 | Apr 5 |
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 1 | Oct 12 | Oct 25 |
| 32°F | Oct 8 | Oct 23 | Nov 6 |
| 28°F | Oct 18 | Nov 2 | Nov 19 |
| 24°F | Oct 31 | 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 | 144 days | 163 days | 183 days |
| 32°F | 168 days | 188 days | 208 days |
| 28°F | 192 days | 212 days | 233 days |
| 24°F | 215 days | 237 days | 261 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 |
|---|---|---|---|
| 06903 | 7a | 0 to 5°F | 2 km |
| 06907 | 7a | 0 to 5°F | 3 km |
| 06905 | 7a | 0 to 5°F | 4 km |
| 06840 | 7a | 0 to 5°F | 6 km |
| 06906 | 7a | 0 to 5°F | 6 km |
| 06902 | 7a | 0 to 5°F | 7 km |
| 06820 | 7a | 0 to 5°F | 8 km |
| 06901 | 7a | 0 to 5°F | 8 km |
| 06807 | 7a | 0 to 5°F | 8 km |
| 06850 | 7a | 0 to 5°F | 9 km |
| 10506 | 7a | 0 to 5°F | 10 km |
| 06854 | 7a | 0 to 5°F | 11 km |
| 06878 | 7b | 5 to 10°F | 11 km |
| 10576 | 6b | -5 to 0°F | 11 km |
| 06853 | 7a | 0 to 5°F | 11 km |
| 06870 | 7b | 5 to 10°F | 11 km |
| 06851 | 7a | 0 to 5°F | 12 km |
| 06897 | 7a | 0 to 5°F | 13 km |
| 06855 | 7b | 5 to 10°F | 14 km |
| 06880 | 7a | 0 to 5°F | 17 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 USC00067970, at 41.1247, -73.5475, elevation 58 m (190 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 119.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Danbury Muni Airport (28 km)
- Danbury (32 km)
- Bridgeport Sikorsky Mem Airport (35 km)
- Ansonia 1 NE (46 km)
- New Haven Tweed Airport (57 km)
- Mount Carmel (62 km)
- Meriden Markham Muni Airport (74 km)
- Burlington (90 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.