Frost dates for 54115De Pere, WI
The average last spring frost in De Pere is April 30 and the average first fall frost is October 9, giving a typical growing season of about 161 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 30
- Average first fall frost
- Oct 9
- Growing season
- 161 days
Safer after May 16 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 185 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 29 · May 13 · May 27 | Sep 16 · Sep 29 · Oct 12 | 140 days | 100% |
| Frost / freeze (32°F) | Apr 16 · Apr 30 · May 16 | Sep 24 · Oct 9 · Oct 26 | 161 days | 100% |
| Hard freeze (28°F) | Apr 3 · Apr 17 · May 4 | Oct 6 · Oct 24 · Nov 9 | 187 days | 100% |
Planting calendar for De Pere
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 30 – Jun 5 |
| Tomatoes | Transplant outdoors | May 16 – Jun 19 |
| Peppers | Start seeds indoors | Mar 30 – Apr 30 |
| Peppers | Transplant outdoors | May 30 – Jun 30 |
| Eggplant | Start seeds indoors | Apr 16 – May 15 |
| Eggplant | Transplant outdoors | May 30 – Jun 30 |
| Cucumbers | Sow outdoors | May 30 – Jun 29 |
| Summer squash | Sow outdoors | May 16 – Jun 30 |
| Winter squash & pumpkins | Sow outdoors | May 30 – Jun 30 |
| Snap beans | Sow outdoors | May 16 – Jul 22 |
| Sweet corn | Sow outdoors | May 16 – Jun 19 |
| Watermelon & cantaloupe | Sow outdoors | May 30 – Jun 30 |
| Okra | Sow outdoors | May 23 – Jun 15 |
| Peas | Sow outdoors (spring) | Mar 30 – May 15 |
| Potatoes | Plant outdoors (spring) | Mar 30 – May 30 |
| Onions | Start seeds indoors (spring) | Feb 16 – Mar 15 |
| Onions | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (spring) | Mar 12 – Apr 15 |
| Broccoli | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (fall) | Jun 9 – Jun 19 |
| Broccoli | Transplant outdoors (fall) | Jul 9 – Jul 20 |
| Cabbage | Start seeds indoors (spring) | Mar 2 – Mar 30 |
| Cabbage | Transplant outdoors (spring) | Mar 30 – Apr 30 |
| Cabbage | Start seeds indoors (fall) | May 30 – Jun 29 |
| Cabbage | Transplant outdoors (fall) | Jun 29 – Jul 30 |
| Leaf lettuce | Sow outdoors (spring) | Mar 30 – Jun 15 |
| Leaf lettuce | Sow outdoors (fall) | Jun 29 – Aug 15 |
| Spinach | Sow outdoors (spring) | Mar 23 – May 6 |
| Spinach | Sow outdoors (fall) | Jul 16 – Aug 20 |
| Radishes | Sow outdoors (spring) | Mar 30 – May 20 |
| Radishes | Sow outdoors (fall) | Jun 29 – Aug 30 |
| Kale | Sow outdoors (spring) | Apr 16 – May 6 |
| Kale | Sow outdoors (fall) | Jun 22 – Jul 30 |
| Carrots | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Carrots | Sow outdoors (fall) | May 30 – Jul 15 |
| Garlic | Plant outdoors (fall) | Sep 29 – Oct 30 |
Where these dates come from
ZIP code 54115 is matched to the NOAA station Green Bay, WI, 7 km away, at 682 ft elevation (72 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Green Bay, WI (used) | 682 ft | Apr 30 | Oct 9 |
| Green Bay Wfo, WI | 682 ft | May 1 | Oct 11 |
| Green Bay Botanical, WI | 694 ft | May 7 | Oct 9 |
| Denmark Wwtp, WI | 811 ft | May 6 | Oct 12 |
Frost dates near De Pere
- Green Bay, WI 54344 · last Apr 30, first Oct 9
- Oneida, WI 54155 · last May 1, first Oct 11
- Wrightstown, WI 54180 · last May 1, first Oct 11
- Greenleaf, WI 54126 · last May 6, first Oct 6
- Seymour, WI 54165 · last May 1, first Oct 11
- Denmark, WI 54208 · last May 6, first Oct 12
- Kaukauna, WI 54130 · last May 4, first Oct 6
- Suamico, WI 54173 · last May 7, first Oct 9
Frequently asked questions
- When is the last frost in De Pere, WI?
- For ZIP code 54115, the average last spring frost (32°F) is April 30, based on NOAA 1991-2020 climate normals for the Green Bay, WI weather station. There is a 1-in-10 chance of a frost after May 16.
- When is the first frost in De Pere, WI?
- The average first fall frost (32°F) is October 9. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 54115?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 161 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.