The last 36°F Spring frost date is 30% likely to be on May 24. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 10. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Sun Prairie, WI are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!
Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | Jun 1 |
| 20% chance | May 28 |
| 30% chance | May 24 |
| 40% chance | May 20 |
| 50% chance | May 17 |
| 60% chance | May 13 |
| 70% chance | May 8 |
| 80% chance | May 4 |
| 90% chance | Apr 29 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 20 |
| 20% chance | May 15 |
| 30% chance | May 10 |
| 40% chance | May 6 |
| 50% chance | May 2 |
| 60% chance | Apr 30 |
| 70% chance | Apr 27 |
| 80% chance | Apr 23 |
| 90% chance | Apr 18 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 8 |
| 20% chance | May 2 |
| 30% chance | Apr 29 |
| 40% chance | Apr 25 |
| 50% chance | Apr 22 |
| 60% chance | Apr 19 |
| 70% chance | Apr 15 |
| 80% chance | Apr 11 |
| 90% chance | Apr 6 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 26 |
| 20% chance | Apr 20 |
| 30% chance | Apr 17 |
| 40% chance | Apr 13 |
| 50% chance | Apr 10 |
| 60% chance | Apr 7 |
| 70% chance | Apr 4 |
| 80% chance | Apr 1 |
| 90% chance | Mar 28 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Apr 16 |
| 20% chance | Apr 11 |
| 30% chance | Apr 7 |
| 40% chance | Apr 4 |
| 50% chance | Apr 1 |
| 60% chance | Mar 30 |
| 70% chance | Mar 26 |
| 80% chance | Mar 22 |
| 90% chance | Mar 17 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Apr 8 |
| 20% chance | Apr 2 |
| 30% chance | Mar 31 |
| 40% chance | Mar 26 |
| 50% chance | Mar 23 |
| 60% chance | Mar 19 |
| 70% chance | Mar 16 |
| 80% chance | Mar 12 |
| 90% chance | Mar 8 |
Agricultural climatic data from weather station: MADISON DANE RGNL AP (USW00014837)