Frost dates for Hustisford Wastewater Plant, WI
At Hustisford Wastewater Plant, the median last spring frost (32°F) is Apr 28 and the median first fall frost is Oct 10, for a typical growing season of 164 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zone 5a.
- Apr 28Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 10First fall frost (median)50% chance of 32°F by this date
- 164 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 26 | May 10 | May 26 |
| 32°F | Apr 14 | Apr 28 | May 13 |
| 28°F | Apr 3 | Apr 16 | Apr 30 |
| 24°F | Mar 22 | Apr 5 | Apr 18 |
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 18 | Oct 1 | Oct 12 |
| 32°F | Sep 26 | Oct 10 | Oct 24 |
| 28°F | Oct 6 | Oct 22 | Nov 5 |
| 24°F | Oct 18 | Nov 1 | Nov 17 |
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 | 123 days | 143 days | 162 days |
| 32°F | 143 days | 164 days | 183 days |
| 28°F | 166 days | 186 days | 209 days |
| 24°F | 191 days | 210 days | 232 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 |
|---|---|---|---|
| 53034 | 5a | -20 to -15°F | 2 km |
| 53035 | 5a | -20 to -15°F | 7 km |
| 53099 | 5a | -20 to -15°F | 8 km |
| 53059 | 5a | -20 to -15°F | 8 km |
| 53047 | 5a | -20 to -15°F | 9 km |
| 53039 | 5a | -20 to -15°F | 9 km |
| 53016 | 5a | -20 to -15°F | 10 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 USC00473820, at 43.3400, -88.6006, elevation 263 m (864 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 148.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Horicon Wastewater Plant (11 km)
- Hartford Wastewater Plant (15 km)
- Watertown Wastewater Plant (21 km)
- Beaver Dam Wastewater Plant (23 km)
- Slinger Wastewater Plant (24 km)
- Town Of Westford (27 km)
- Oconomowoc Wastewater Plant (28 km)
- W Bend Public Works (34 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.