Frost dates for Vadnais Lake, MN
At Vadnais Lake, the median last spring frost (32°F) is Apr 23 and the median first fall frost is Oct 20, for a typical growing season of 177 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- Apr 23Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 177 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 19 | May 2 | May 16 |
| 32°F | Apr 9 | Apr 23 | May 7 |
| 28°F | Apr 2 | Apr 14 | Apr 27 |
| 24°F | Mar 24 | Apr 7 | Apr 21 |
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 24 | Oct 7 | Oct 20 |
| 32°F | Oct 3 | Oct 20 | Nov 2 |
| 28°F | Oct 15 | Oct 31 | Nov 12 |
| 24°F | Oct 27 | Nov 6 | Nov 21 |
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 | 138 days | 157 days | 176 days |
| 32°F | 159 days | 177 days | 197 days |
| 28°F | 178 days | 197 days | 216 days |
| 24°F | 194 days | 212 days | 231 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 |
|---|---|---|---|
| 55127 | 5a | -20 to -15°F | 4 km |
| 55117 | 5a | -20 to -15°F | 5 km |
| 55126 | 5a | -20 to -15°F | 5 km |
| 55109 | 5a | -20 to -15°F | 6 km |
| 55112 | 5a | -20 to -15°F | 8 km |
| 55110 | 5a | -20 to -15°F | 9 km |
| 55014 | 5a | -20 to -15°F | 14 km |
| 55038 | 4b | -25 to -20°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 USC00218477, at 45.0483, -93.0958, elevation 271 m (890 ft).
- Data quality: Representative (10+ years), 26 years of freeze data.
- Average days per year at or below 32°F: 157.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- U Of Mn St. Paul (9 km)
- St. Paul (12 km)
- St. Paul Downtown Airport (13 km)
- St. Paul 3sw (14 km)
- Lower St. Anthony Falls (14 km)
- Stillwater 2sw (19 km)
- Mpls Crystal Airport (20 km)
- Minneapolis/st Paul Airport (21 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.