Frost dates for 53004Belgium, WI
The average last spring frost in Belgium is May 5 and the average first fall frost is October 12, giving a typical growing season of about 159 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 5
- Average first fall frost
- Oct 12
- Growing season
- 159 days
Safer after May 22 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 183 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 2 · May 19 · Jun 1 | Sep 20 · Oct 1 · Oct 14 | 136 days | 100% |
| Frost / freeze (32°F) | Apr 20 · May 5 · May 22 | Sep 27 · Oct 12 · Oct 27 | 159 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 9 | Oct 8 · Oct 25 · Nov 7 | 184 days | 100% |
Planting calendar for Belgium
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 22 |
| 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 – Jul 2 |
| Summer squash | Sow outdoors | May 21 – Jul 5 |
| Winter squash & pumpkins | Sow outdoors | Jun 4 – Jul 5 |
| Snap beans | Sow outdoors | May 21 – Jul 25 |
| Sweet corn | Sow outdoors | May 21 – Jun 22 |
| 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 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 7 – Apr 4 |
| Cabbage | Transplant outdoors (spring) | Apr 4 – May 5 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Apr 4 – Jun 20 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 28 – May 11 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Apr 4 – May 25 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 21 – May 11 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | May 5 – Jun 20 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 53004 is matched to the NOAA station Belgium Wwtp, WI, 1.6 km away, at 731 ft elevation (4 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Belgium Wwtp, WI (used) | 731 ft | May 5 | Oct 12 |
| Port Washington, WI | 594 ft | Apr 27 | Oct 22 |
| Saukville Wwtp, WI | 766 ft | May 5 | Oct 11 |
| Hingham Wwtp, WI | 763 ft | May 3 | Oct 16 |
Frost dates near Belgium
- Cedar Grove, WI 53013 · last May 3, first Oct 16
- Fredonia, WI 53021 · last May 3, first Oct 16
- Port Washington, WI 53074 · last Apr 27, first Oct 22
- Random Lake, WI 53075 · last May 3, first Oct 16
- Oostburg, WI 53070 · last May 3, first Oct 16
- Saukville, WI 53080 · last Apr 27, first Oct 22
- Hingham, WI 53031 · last May 3, first Oct 16
- Newburg, WI 53060 · last May 4, first Oct 11
Frequently asked questions
- When is the last frost in Belgium, WI?
- For ZIP code 53004, the average last spring frost (32°F) is May 5, based on NOAA 1991-2020 climate normals for the Belgium Wwtp, WI weather station. There is a 1-in-10 chance of a frost after May 22.
- When is the first frost in Belgium, WI?
- The average first fall frost (32°F) is October 12. 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 53004?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 159 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.