Frost dates for Madison Wastewater Plant, MN
At Madison Wastewater Plant, the median last spring frost (32°F) is May 3 and the median first fall frost is Oct 2, for a typical growing season of 151 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 3Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 2First fall frost (median)50% chance of 32°F by this date
- 151 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 12 | May 25 |
| 32°F | Apr 21 | May 3 | May 15 |
| 28°F | Apr 9 | Apr 23 | May 5 |
| 24°F | Apr 1 | 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 11 | Sep 24 | Oct 6 |
| 32°F | Sep 20 | Oct 2 | Oct 15 |
| 28°F | Sep 29 | Oct 12 | Oct 26 |
| 24°F | Oct 7 | Oct 23 | Nov 4 |
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 | 117 days | 135 days | 152 days |
| 32°F | 134 days | 151 days | 168 days |
| 28°F | 152 days | 169 days | 190 days |
| 24°F | 169 days | 189 days | 207 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 |
|---|---|---|---|
| 56256 | 4b | -25 to -20°F | 4 km |
| 56232 | 4b | -25 to -20°F | 13 km |
| 56257 | 4b | -25 to -20°F | 19 km |
| 56212 | 4b | -25 to -20°F | 19 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 USC00214994, at 45.0022, -96.1661, elevation 328 m (1,075 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 168.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milan 1nw (23 km)
- Canby (33 km)
- Montevideo 1sw (34 km)
- Artichoke Lake 1 E (43 km)
- Granite Falls (53 km)
- Benson (55 km)
- Marshall (66 km)
- Morris W Cntrl Rsch & Outreach (69 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.