Frost dates for Collegeville St. John's, MN
At Collegeville St. John's, the median last spring frost (32°F) is May 3 and the median first fall frost is Oct 7, for a typical growing season of 155 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 3Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 7First fall frost (median)50% chance of 32°F by this date
- 155 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 30 | May 13 | May 28 |
| 32°F | Apr 21 | May 3 | May 17 |
| 28°F | Apr 10 | Apr 24 | May 7 |
| 24°F | Apr 2 | Apr 14 | Apr 28 |
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 17 | Sep 28 | Oct 10 |
| 32°F | Sep 25 | Oct 7 | Oct 19 |
| 28°F | Oct 4 | Oct 18 | Nov 1 |
| 24°F | Oct 14 | Oct 29 | 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 | 118 days | 138 days | 155 days |
| 32°F | 137 days | 155 days | 172 days |
| 28°F | 157 days | 176 days | 194 days |
| 24°F | 177 days | 196 days | 214 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 |
|---|---|---|---|
| 56321 | 4b | -25 to -20°F | 0 km |
| 56374 | 4b | -25 to -20°F | 6 km |
| 56310 | 4b | -25 to -20°F | 8 km |
| 56320 | 4b | -25 to -20°F | 13 km |
| 56369 | 4b | -25 to -20°F | 13 km |
| 56387 | 4b | -25 to -20°F | 13 km |
| 56301 | 4b | -25 to -20°F | 16 km |
| 56307 | 4b | -25 to -20°F | 16 km |
| 56368 | 4b | -25 to -20°F | 18 km |
| 56371 | 4b | -25 to -20°F | 25 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 USC00211691, at 45.5794, -94.3919, elevation 369 m (1,210 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 159.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rice (24 km)
- Kimball 3n (26 km)
- St. Cloud Regional Airport (27 km)
- Melrose (34 km)
- Little Falls 2nne (47 km)
- Santiago 3 E (50 km)
- Litchfield (51 km)
- New London (52 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.