Frost dates for Delano, MN
At Delano, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 8, for a typical growing season of 159 days. For a 90% chance that the last frost has passed, wait until May 14. Nearby ZIP codes are in USDA hardiness zone 4b.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 14Safer planting date10% chance of 32°F after this date
- Oct 8First fall frost (median)50% chance of 32°F by this date
- 159 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 28 | May 9 | May 25 |
| 32°F | Apr 18 | Apr 30 | May 14 |
| 28°F | Apr 6 | Apr 22 | May 3 |
| 24°F | Mar 29 | Apr 11 | Apr 26 |
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 15 | Sep 28 | Oct 10 |
| 32°F | Sep 24 | Oct 8 | Oct 21 |
| 28°F | Oct 4 | Oct 19 | Nov 1 |
| 24°F | Oct 17 | Oct 30 | Nov 12 |
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 | 122 days | 141 days | 160 days |
| 32°F | 140 days | 159 days | 180 days |
| 28°F | 161 days | 181 days | 202 days |
| 24°F | 182 days | 200 days | 220 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 |
|---|---|---|---|
| 55328 | 4b | -25 to -20°F | 3 km |
| 55373 | 4b | -25 to -20°F | 6 km |
| 55359 | 4b | -25 to -20°F | 8 km |
| 55357 | 4b | -25 to -20°F | 10 km |
| 55363 | 4b | -25 to -20°F | 11 km |
| 55388 | 4b | -25 to -20°F | 12 km |
| 55390 | 4b | -25 to -20°F | 16 km |
| 55356 | 4b | -25 to -20°F | 16 km |
| 55340 | 4b | -25 to -20°F | 16 km |
| 55360 | 4b | -25 to -20°F | 18 km |
| 55367 | 4b | -25 to -20°F | 23 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 USC00212088, at 45.0469, -93.7772, elevation 297 m (975 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 166.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Buffalo 2ne (17 km)
- Chanhassen Wsfo (28 km)
- Chaska 2nw (28 km)
- New Hope (32 km)
- Elk River (32 km)
- Mpls Crystal Airport (34 km)
- Mpls Flying Cloud Airport (34 km)
- Dassel 3se (39 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.