Last spring frost
Apr 19
Frost Dates for Pleasant Prairie, WI
First fall frost
Oct 26
Growing season
189 days
Hardiness zone
5b
In an average year around Pleasant Prairie, WI, the last spring frost (32°F) is about Apr 19 and the first fall frost is about Oct 26, giving roughly a 189-day growing season. To be safe most years, wait until Apr 6 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 16 | May 1 | Apr 17 |
| Freeze (32°F) | May 3 | Apr 19 | Apr 6 |
| Hard (28°F) | Apr 21 | Apr 8 | Mar 26 |
| Severe (24°F) | Apr 11 | Mar 29 | Mar 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 16 | May 11 | May 7 | May 4 | May 1 | Apr 29 | Apr 26 | Apr 22 | Apr 17 |
| 32°F | May 3 | Apr 29 | Apr 25 | Apr 22 | Apr 19 | Apr 16 | Apr 13 | Apr 11 | Apr 6 |
| 28°F | Apr 21 | Apr 17 | Apr 12 | Apr 10 | Apr 8 | Apr 5 | Apr 3 | Mar 31 | Mar 26 |
| 24°F | Apr 11 | Apr 6 | Apr 3 | Apr 1 | Mar 29 | Mar 26 | Mar 22 | Mar 18 | Mar 12 |
| 20°F | Apr 3 | Mar 30 | Mar 26 | Mar 21 | Mar 17 | Mar 14 | Mar 11 | Mar 7 | Mar 3 |
| 16°F | Mar 27 | Mar 20 | Mar 16 | Mar 13 | Mar 9 | Mar 6 | Mar 3 | Feb 28 | Feb 22 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 1 | Oct 17 | Oct 29 |
| Freeze (32°F) | Oct 11 | Oct 26 | Nov 9 |
| Hard (28°F) | Oct 24 | Nov 6 | Nov 20 |
| Severe (24°F) | Nov 1 | Nov 15 | Nov 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 1 | Oct 7 | Oct 10 | Oct 14 | Oct 17 | Oct 19 | Oct 22 | Oct 25 | Oct 29 |
| 32°F | Oct 11 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 9 |
| 28°F | Oct 24 | Oct 28 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 20 |
| 24°F | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 25 | Nov 29 |
| 20°F | Nov 8 | Nov 13 | Nov 17 | Nov 21 | Nov 24 | Nov 26 | Nov 30 | Dec 3 | Dec 9 |
| 16°F | Nov 16 | Nov 21 | Nov 26 | Nov 29 | Dec 1 | Dec 4 | Dec 8 | Dec 13 | Dec 19 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Kenosha, Wi, about 4.4 miles away@if(!empty($station['elevation_ft'])), at 600 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Pleasant Prairie, WI?
On average, the last spring frost (32°F) around Pleasant Prairie, WI is about Apr 19. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 6.
When is the first frost in the fall?
The first fall frost around Pleasant Prairie, WI typically arrives about Oct 26. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 19 on average, or Apr 6 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 189 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 53158 Planting calendar → Wisconsin frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026