Frost dates for 53179Trevor, WI
The average last spring frost in Trevor is April 23 and the average first fall frost is October 21, giving a typical growing season of about 179 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 23
- Average first fall frost
- Oct 21
- Growing season
- 179 days
Safer after May 9 (1-in-10 risk)
Possible by Oct 6 (1-in-10 risk)
Last frost typically in 174 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 21 · May 5 · May 23 | Sep 28 · Oct 11 · Oct 23 | 157 days | 100% |
| Frost / freeze (32°F) | Apr 9 · Apr 23 · May 9 | Oct 6 · Oct 21 · Nov 3 | 179 days | 100% |
| Hard freeze (28°F) | Mar 30 · Apr 11 · Apr 27 | Oct 17 · Nov 1 · Nov 15 | 202 days | 100% |
Planting calendar for Trevor
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 23 – May 29 |
| Tomatoes | Transplant outdoors | May 9 – Jul 1 |
| Peppers | Start seeds indoors | Mar 23 – Apr 23 |
| Peppers | Transplant outdoors | May 23 – Jun 23 |
| Eggplant | Start seeds indoors | Apr 9 – May 8 |
| Eggplant | Transplant outdoors | May 23 – Jun 23 |
| Cucumbers | Sow outdoors | May 23 – Jul 11 |
| Summer squash | Sow outdoors | May 9 – Jun 23 |
| Winter squash & pumpkins | Sow outdoors | May 23 – Jun 23 |
| Snap beans | Sow outdoors | May 9 – Aug 3 |
| Sweet corn | Sow outdoors | May 9 – Jul 1 |
| Watermelon & cantaloupe | Sow outdoors | May 23 – Jun 23 |
| Okra | Sow outdoors | May 16 – Jun 8 |
| Peas | Sow outdoors (spring) | Mar 23 – May 8 |
| Potatoes | Plant outdoors (spring) | Mar 23 – May 23 |
| Onions | Start seeds indoors (spring) | Feb 9 – Mar 8 |
| Onions | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (spring) | Mar 5 – Apr 8 |
| Broccoli | Transplant outdoors (spring) | Apr 9 – May 8 |
| Broccoli | Start seeds indoors (fall) | Jun 21 – Jul 1 |
| Broccoli | Transplant outdoors (fall) | Jul 21 – Aug 1 |
| Cabbage | Start seeds indoors (spring) | Feb 23 – Mar 23 |
| Cabbage | Transplant outdoors (spring) | Mar 23 – Apr 23 |
| Cabbage | Start seeds indoors (fall) | Jun 11 – Jul 11 |
| Cabbage | Transplant outdoors (fall) | Jul 11 – Aug 11 |
| Leaf lettuce | Sow outdoors (spring) | Mar 23 – Jun 8 |
| Leaf lettuce | Sow outdoors (fall) | Jul 11 – Aug 27 |
| Spinach | Sow outdoors (spring) | Mar 16 – Apr 29 |
| Spinach | Sow outdoors (fall) | Jul 28 – Sep 1 |
| Radishes | Sow outdoors (spring) | Mar 23 – May 13 |
| Radishes | Sow outdoors (fall) | Jul 11 – Sep 11 |
| Kale | Sow outdoors (spring) | Apr 9 – Apr 29 |
| Kale | Sow outdoors (fall) | Jul 4 – Aug 11 |
| Carrots | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Carrots | Sow outdoors (fall) | Jun 11 – Jul 27 |
| Garlic | Plant outdoors (fall) | Oct 11 – Nov 11 |
Where these dates come from
ZIP code 53179 is matched to the NOAA station Antioch, IL, 5.4 km away, at 750 ft elevation (9 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Antioch, IL (used) | 750 ft | Apr 23 | Oct 21 |
| Paddock Lake, WI | 775 ft | Apr 30 | Oct 15 |
| Lake Villa 2Ne, IL | 840 ft | Apr 24 | Oct 23 |
| Pell Lake, WI | 840 ft | Apr 30 | Oct 13 |
Frost dates near Trevor
- Camp Lake, WI 53109 · last Apr 23, first Oct 21
- Wilmot, WI 53192 · last Apr 23, first Oct 21
- Silver Lake, WI 53170 · last Apr 23, first Oct 21
- Benet Lake, WI 53102 · last Apr 23, first Oct 21
- Salem, WI 53168 · last Apr 23, first Oct 21
- Antioch, IL 60002 · last Apr 23, first Oct 21
- Bristol, WI 53104 · last Apr 23, first Oct 21
- Bassett, WI 53101 · last May 5, first Oct 9
Frequently asked questions
- When is the last frost in Trevor, WI?
- For ZIP code 53179, the average last spring frost (32°F) is April 23, based on NOAA 1991-2020 climate normals for the Antioch, IL weather station. There is a 1-in-10 chance of a frost after May 9.
- When is the first frost in Trevor, WI?
- The average first fall frost (32°F) is October 21. There is a 1-in-10 chance of frost by October 6, so tender plants are at risk from that point on.
- How long is the growing season in 53179?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 179 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.