Frost dates for 53171Somers, WI
The average last spring frost in Somers is April 28 and the average first fall frost is October 19, giving a typical growing season of about 174 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 28
- Average first fall frost
- Oct 19
- Growing season
- 174 days
Safer after May 13 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 176 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) | Apr 25 · May 8 · May 26 | Sep 23 · Oct 7 · Oct 22 | 148 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 28 · May 13 | Oct 1 · Oct 19 · Oct 31 | 174 days | 100% |
| Hard freeze (28°F) | Apr 1 · Apr 15 · May 2 | Oct 15 · Oct 30 · Nov 13 | 196 days | 100% |
Planting calendar for Somers
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 | Mar 28 – Jun 3 |
| Tomatoes | Transplant outdoors | May 14 – Jun 29 |
| Peppers | Start seeds indoors | Mar 28 – Apr 28 |
| Peppers | Transplant outdoors | May 28 – Jun 28 |
| Eggplant | Start seeds indoors | Apr 14 – May 13 |
| Eggplant | Transplant outdoors | May 28 – Jun 28 |
| Cucumbers | Sow outdoors | May 28 – Jul 9 |
| Summer squash | Sow outdoors | May 14 – Jun 28 |
| Winter squash & pumpkins | Sow outdoors | May 28 – Jun 28 |
| Snap beans | Sow outdoors | May 14 – Aug 1 |
| Sweet corn | Sow outdoors | May 14 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 28 – Jun 28 |
| Okra | Sow outdoors | May 21 – Jun 13 |
| Peas | Sow outdoors (spring) | Mar 28 – May 13 |
| Potatoes | Plant outdoors (spring) | Mar 28 – May 28 |
| Onions | Start seeds indoors (spring) | Feb 14 – Mar 13 |
| Onions | Transplant outdoors (spring) | Apr 14 – May 13 |
| Broccoli | Start seeds indoors (spring) | Mar 10 – Apr 13 |
| Broccoli | Transplant outdoors (spring) | Apr 14 – May 13 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 28 – Mar 28 |
| Cabbage | Transplant outdoors (spring) | Mar 28 – Apr 28 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 28 – Jun 13 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 21 – May 4 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 28 – May 18 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 14 – May 4 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 28 – Jun 13 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 53171 is matched to the NOAA station Kenosha Rgnl Ap, WI, 6 km away, at 743 ft elevation (51 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Kenosha Rgnl Ap, WI (used) | 743 ft | Apr 28 | Oct 19 |
| Kenosha, WI | 600 ft | Apr 19 | Oct 26 |
| Racine, WI | 595 ft | Apr 20 | Oct 24 |
| Union Grove, WI | 730 ft | May 5 | Oct 8 |
Frost dates near Somers
- Kenosha, WI 53144 · last Apr 28, first Oct 19
- Sturtevant, WI 53177 · last May 5, first Oct 8
- Racine, WI 53406 · last Apr 24, first Oct 24
- Union Grove, WI 53182 · last May 5, first Oct 8
- Woodworth, WI 53194 · last Apr 28, first Oct 19
- Pleasant Prairie, WI 53158 · last Apr 28, first Oct 19
- Russell, IL 60075 · last Apr 30, first Oct 21
- Bristol, WI 53104 · last Apr 23, first Oct 21
Frequently asked questions
- When is the last frost in Somers, WI?
- For ZIP code 53171, the average last spring frost (32°F) is April 28, based on NOAA 1991-2020 climate normals for the Kenosha Rgnl Ap, WI weather station. There is a 1-in-10 chance of a frost after May 13.
- When is the first frost in Somers, WI?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 53171?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 174 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.