Frost dates for Meriden Markham Muni Airport, CT
At Meriden Markham Muni Airport, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 16, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 16First fall frost (median)50% chance of 32°F by this date
- 175 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 24 | May 7 | May 21 |
| 32°F | Apr 11 | Apr 26 | May 9 |
| 28°F | Mar 30 | Apr 10 | Apr 28 |
| 24°F | Mar 13 | Mar 30 | Apr 12 |
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 26 | Oct 6 | Oct 19 |
| 32°F | Oct 4 | Oct 16 | Nov 1 |
| 28°F | Oct 14 | Oct 30 | Nov 12 |
| 24°F | Oct 25 | Nov 9 | Nov 25 |
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 | 134 days | 152 days | 171 days |
| 32°F | 156 days | 175 days | 194 days |
| 28°F | 179 days | 198 days | 218 days |
| 24°F | 202 days | 223 days | 244 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 |
|---|---|---|---|
| 06451 | 6b | -5 to 0°F | 4 km |
| 06450 | 6b | -5 to 0°F | 5 km |
| 06492 | 6b | -5 to 0°F | 6 km |
| 06410 | 6b | -5 to 0°F | 6 km |
| 06467 | 6b | -5 to 0°F | 9 km |
| 06455 | 6b | -5 to 0°F | 9 km |
| 06479 | 6b | -5 to 0°F | 10 km |
| 06444 | 6b | -5 to 0°F | 10 km |
| 06481 | 6b | -5 to 0°F | 11 km |
| 06037 | 6b | -5 to 0°F | 11 km |
| 06489 | 6b | -5 to 0°F | 12 km |
| 06422 | 6b | -5 to 0°F | 13 km |
| 06705 | 6b | -5 to 0°F | 14 km |
| 06023 | 6b | -5 to 0°F | 15 km |
| 06459 | 6b | -5 to 0°F | 15 km |
| 06457 | 6b | -5 to 0°F | 15 km |
| 06716 | 6b | -5 to 0°F | 15 km |
| 06706 | 6b | -5 to 0°F | 17 km |
| 06702 | 6b | -5 to 0°F | 19 km |
| 06710 | 6b | -5 to 0°F | 19 km |
| 06704 | 6b | -5 to 0°F | 19 km |
| 06708 | 6b | -5 to 0°F | 21 km |
| 06441 | 6b | -5 to 0°F | 21 km |
| 06779 | 6b | -5 to 0°F | 23 km |
| 06419 | 6b | -5 to 0°F | 26 km |
| 06438 | 6b | -5 to 0°F | 27 km |
| 06412 | 6b | -5 to 0°F | 30 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 USW00054788, at 41.5097, -72.8278, elevation 31 m (103 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 129.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Carmel (13 km)
- New Haven Tweed Airport (28 km)
- Ansonia 1 NE (28 km)
- Hartford Brainard Field (29 km)
- Burlington (33 km)
- Bakersville (40 km)
- Bridgeport Sikorsky Mem Airport (46 km)
- Barkhamsted (47 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.