Frost dates for 53139Kansasville, WI
The average last spring frost in Kansasville is May 5 and the average first fall frost is October 8, giving a typical growing season of about 156 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 5
- Average first fall frost
- Oct 8
- Growing season
- 156 days
Safer after May 20 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 184 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 1 · May 17 · May 31 | Sep 18 · Sep 30 · Oct 12 | 136 days | 100% |
| Frost / freeze (32°F) | Apr 21 · May 5 · May 20 | Sep 27 · Oct 8 · Oct 23 | 156 days | 100% |
| Hard freeze (28°F) | Apr 9 · Apr 23 · May 10 | Oct 4 · Oct 20 · Nov 3 | 178 days | 100% |
Planting calendar for Kansasville
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 4 – Jun 10 |
| Tomatoes | Transplant outdoors | May 21 – Jun 18 |
| Peppers | Start seeds indoors | Apr 4 – May 5 |
| Peppers | Transplant outdoors | Jun 4 – Jul 5 |
| Eggplant | Start seeds indoors | Apr 21 – May 20 |
| Eggplant | Transplant outdoors | Jun 4 – Jul 5 |
| Cucumbers | Sow outdoors | Jun 4 – Jun 28 |
| Summer squash | Sow outdoors | May 21 – Jul 5 |
| Winter squash & pumpkins | Sow outdoors | Jun 4 – Jul 5 |
| Snap beans | Sow outdoors | May 21 – Jul 21 |
| Sweet corn | Sow outdoors | May 21 – Jun 18 |
| Watermelon & cantaloupe | Sow outdoors | Jun 4 – Jul 5 |
| Okra | Sow outdoors | May 28 – Jun 20 |
| Peas | Sow outdoors (spring) | Apr 4 – May 20 |
| Potatoes | Plant outdoors (spring) | Apr 4 – Jun 4 |
| Onions | Start seeds indoors (spring) | Feb 21 – Mar 20 |
| Onions | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (spring) | Mar 17 – Apr 20 |
| Broccoli | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (fall) | Jun 8 – Jun 18 |
| Broccoli | Transplant outdoors (fall) | Jul 8 – Jul 19 |
| Cabbage | Start seeds indoors (spring) | Mar 7 – Apr 4 |
| Cabbage | Transplant outdoors (spring) | Apr 4 – May 5 |
| Cabbage | Start seeds indoors (fall) | May 29 – Jun 28 |
| Cabbage | Transplant outdoors (fall) | Jun 28 – Jul 29 |
| Leaf lettuce | Sow outdoors (spring) | Apr 4 – Jun 20 |
| Leaf lettuce | Sow outdoors (fall) | Jun 28 – Aug 14 |
| Spinach | Sow outdoors (spring) | Mar 28 – May 11 |
| Spinach | Sow outdoors (fall) | Jul 15 – Aug 19 |
| Radishes | Sow outdoors (spring) | Apr 4 – May 25 |
| Radishes | Sow outdoors (fall) | Jun 28 – Aug 29 |
| Kale | Sow outdoors (spring) | Apr 21 – May 11 |
| Kale | Sow outdoors (fall) | Jun 21 – Jul 29 |
| Carrots | Sow outdoors (spring) | May 5 – Jun 20 |
| Carrots | Sow outdoors (fall) | May 29 – Jul 14 |
| Garlic | Plant outdoors (fall) | Sep 28 – Oct 29 |
Where these dates come from
ZIP code 53139 is matched to the NOAA station Union Grove, WI, 7 km away, at 730 ft elevation (64 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Union Grove, WI (used) | 730 ft | May 5 | Oct 8 |
| Rochester Wwtp, WI | 783 ft | May 5 | Oct 10 |
| Burlington, WI | 751 ft | May 5 | Oct 9 |
| Paddock Lake, WI | 775 ft | Apr 30 | Oct 15 |
Frost dates near Kansasville
- Union Grove, WI 53182 · last May 5, first Oct 8
- Waterford, WI 53185 · last May 5, first Oct 9
- Rochester, WI 53167 · last May 5, first Oct 9
- Burlington, WI 53105 · last May 5, first Oct 9
- Franksville, WI 53126 · last May 5, first Oct 8
- Salem, WI 53168 · last Apr 23, first Oct 21
- Honey Creek, WI 53138 · last May 5, first Oct 9
- New Munster, WI 53152 · last May 5, first Oct 9
Frequently asked questions
- When is the last frost in Kansasville, WI?
- For ZIP code 53139, the average last spring frost (32°F) is May 5, based on NOAA 1991-2020 climate normals for the Union Grove, WI weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Kansasville, WI?
- The average first fall frost (32°F) is October 8. There is a 1-in-10 chance of frost by September 27, so tender plants are at risk from that point on.
- How long is the growing season in 53139?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 156 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.