Frost dates for Lynxville Dam 9, WI
At Lynxville Dam 9, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 17, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zone 5a.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 175 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 22 | May 5 | May 19 |
| 32°F | Apr 9 | Apr 24 | May 8 |
| 28°F | Mar 30 | Apr 11 | Apr 29 |
| 24°F | Mar 20 | Apr 3 | 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 24 | Oct 7 | Oct 20 |
| 32°F | Oct 4 | Oct 17 | Oct 28 |
| 28°F | Oct 14 | Oct 27 | Nov 7 |
| 24°F | Oct 24 | Nov 5 | 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 | 134 days | 154 days | 171 days |
| 32°F | 157 days | 175 days | 193 days |
| 28°F | 177 days | 197 days | 215 days |
| 24°F | 197 days | 216 days | 236 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 |
|---|---|---|---|
| 54626 | 5a | -20 to -15°F | 4 km |
| 52146 | 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 USC00474937, at 43.2117, -91.0986, elevation 193 m (633 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 134.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Prairie Du Chien (18 km)
- Steuben 4 SE (23 km)
- Gays Mills (23 km)
- Boscobel Airport (35 km)
- Genoa Dam 8 (41 km)
- Viroqua (43 km)
- Lancaster 4 WSW (50 km)
- Richland Center (59 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.