Frost dates for Belgium Wastewater Plant, WI
At Belgium Wastewater Plant, the median last spring frost (32°F) is May 5 and the median first fall frost is Oct 12, for a typical growing season of 159 days. For a 90% chance that the last frost has passed, wait until May 22. Nearby ZIP codes are in USDA hardiness zone 5b.
- May 5Last spring frost (median)50% chance of 32°F after this date
- May 22Safer planting date10% chance of 32°F after this date
- Oct 12First fall frost (median)50% chance of 32°F by this date
- 159 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 | May 2 | May 19 | Jun 1 |
| 32°F | Apr 20 | May 5 | May 22 |
| 28°F | Apr 7 | Apr 22 | May 9 |
| 24°F | Mar 25 | Apr 9 | Apr 23 |
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 14 |
| 32°F | Sep 27 | Oct 12 | Oct 27 |
| 28°F | Oct 8 | Oct 25 | Nov 7 |
| 24°F | Oct 22 | Nov 4 | Nov 19 |
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 | 136 days | 156 days |
| 32°F | 138 days | 159 days | 182 days |
| 28°F | 161 days | 184 days | 204 days |
| 24°F | 187 days | 209 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 |
|---|---|---|---|
| 53004 | 5b | -15 to -10°F | 3 km |
| 53013 | 5b | -15 to -10°F | 6 km |
| 53021 | 5b | -15 to -10°F | 13 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 USC00470652, at 43.5133, -87.8547, elevation 223 m (731 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 154.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Port Washington (13 km)
- Hingham Wastewater Plant (15 km)
- Saukville Wastewater Plant (17 km)
- Grafton Wastewater Plant (24 km)
- West Bend (25 km)
- Sheboygan Wastewater Plant (26 km)
- Plymouth Wastewater Plant (26 km)
- Sheboygan Co Mem Airport (28 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.