Frost dates for Horicon Wastewater Plant, WI
At Horicon Wastewater Plant, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 10, for a typical growing season of 158 days. For a 90% chance that the last frost has passed, wait until May 19. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 19Safer planting date10% chance of 32°F after this date
- Oct 10First fall frost (median)50% chance of 32°F by this date
- 158 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 29 | May 13 | May 30 |
| 32°F | Apr 16 | May 1 | May 19 |
| 28°F | Apr 6 | Apr 20 | May 5 |
| 24°F | Mar 26 | Apr 8 | Apr 25 |
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 20 | Oct 1 | Oct 13 |
| 32°F | Sep 27 | Oct 10 | Oct 24 |
| 28°F | Oct 5 | Oct 21 | Nov 4 |
| 24°F | Oct 17 | Nov 1 | Nov 16 |
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 | 138 days | 156 days |
| 32°F | 135 days | 158 days | 180 days |
| 28°F | 161 days | 182 days | 205 days |
| 24°F | 185 days | 206 days | 227 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 |
|---|---|---|---|
| 53032 | 5a | -20 to -15°F | 1 km |
| 53050 | 5a | -20 to -15°F | 10 km |
| 53922 | 5a | -20 to -15°F | 11 km |
| 53091 | 5a | -20 to -15°F | 17 km |
| 53048 | 5a | -20 to -15°F | 21 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 USC00473756, at 43.4389, -88.6314, elevation 268 m (881 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 155.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hustisford Wastewater Plant (11 km)
- Beaver Dam Wastewater Plant (17 km)
- Town Of Westford (21 km)
- Hartford Wastewater Plant (21 km)
- Slinger Wastewater Plant (29 km)
- Watertown Wastewater Plant (31 km)
- W Bend Public Works (35 km)
- Fond Du Lac Co Airport (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.