Frost dates for Andover 1n, MN
At Andover 1n, the median last spring frost (32°F) is May 5 and the median first fall frost is Oct 2, for a typical growing season of 148 days. For a 90% chance that the last frost has passed, wait until May 21. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 5Last spring frost (median)50% chance of 32°F after this date
- May 21Safer planting date10% chance of 32°F after this date
- Oct 2First fall frost (median)50% chance of 32°F by this date
- 148 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 | May 2 | May 16 | May 31 |
| 32°F | Apr 23 | May 5 | May 21 |
| 28°F | Apr 11 | Apr 25 | May 9 |
| 24°F | Apr 3 | Apr 15 | Apr 29 |
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 10 | Sep 24 | Oct 6 |
| 32°F | Sep 18 | Oct 2 | Oct 16 |
| 28°F | Sep 27 | Oct 13 | Oct 27 |
| 24°F | Oct 10 | Oct 25 | Nov 6 |
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 | 109 days | 129 days | 149 days |
| 32°F | 128 days | 148 days | 168 days |
| 28°F | 148 days | 168 days | 189 days |
| 24°F | 169 days | 190 days | 209 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 |
|---|---|---|---|
| 55304 | 4b | -25 to -20°F | 3 km |
| 55448 | 5a | -20 to -15°F | 7 km |
| 55433 | 5a | -20 to -15°F | 10 km |
| 55434 | 5a | -20 to -15°F | 11 km |
| 55303 | 4b | -25 to -20°F | 12 km |
| 55316 | 5a | -20 to -15°F | 12 km |
| 55449 | 5a | -20 to -15°F | 12 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 USC00210190, at 45.2533, -93.2928, elevation 274 m (899 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 172.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cedar (8 km)
- Mpls Crystal Airport (22 km)
- Elk River (24 km)
- Vadnais Lake (28 km)
- New Hope (28 km)
- U Of Mn St. Paul (31 km)
- Lower St. Anthony Falls (31 km)
- Forest Lake 5ne (32 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.