Frost dates for 54227Maribel, WI
The average last spring frost in Maribel is May 6 and the average first fall frost is October 12, giving a typical growing season of about 158 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 6
- Average first fall frost
- Oct 12
- Growing season
- 158 days
Safer after May 20 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 191 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 4 · May 18 · Jun 1 | Sep 19 · Oct 1 · Oct 14 | 136 days | 100% |
| Frost / freeze (32°F) | Apr 22 · May 6 · May 20 | Sep 30 · Oct 12 · Oct 27 | 158 days | 100% |
| Hard freeze (28°F) | Apr 9 · Apr 23 · May 9 | Oct 11 · Oct 26 · Nov 9 | 183 days | 100% |
Planting calendar for Maribel
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 5 – Jun 11 |
| Tomatoes | Transplant outdoors | May 22 – Jun 22 |
| Peppers | Start seeds indoors | Apr 5 – May 6 |
| Peppers | Transplant outdoors | Jun 5 – Jul 6 |
| Eggplant | Start seeds indoors | Apr 22 – May 21 |
| Eggplant | Transplant outdoors | Jun 5 – Jul 6 |
| Cucumbers | Sow outdoors | Jun 5 – Jul 2 |
| Summer squash | Sow outdoors | May 22 – Jul 6 |
| Winter squash & pumpkins | Sow outdoors | Jun 5 – Jul 6 |
| Snap beans | Sow outdoors | May 22 – Jul 25 |
| Sweet corn | Sow outdoors | May 22 – Jun 22 |
| Watermelon & cantaloupe | Sow outdoors | Jun 5 – Jul 6 |
| Okra | Sow outdoors | May 29 – Jun 21 |
| Peas | Sow outdoors (spring) | Apr 5 – May 21 |
| Potatoes | Plant outdoors (spring) | Apr 5 – Jun 5 |
| Onions | Start seeds indoors (spring) | Feb 22 – Mar 21 |
| Onions | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (spring) | Mar 18 – Apr 21 |
| Broccoli | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (fall) | Jun 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 8 – Apr 5 |
| Cabbage | Transplant outdoors (spring) | Apr 5 – May 6 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Apr 5 – Jun 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 29 – May 12 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Apr 5 – May 26 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 22 – May 12 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | May 6 – Jun 21 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 54227 is matched to the NOAA station Denmark Wwtp, WI, 7.4 km away, at 811 ft elevation (55 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Denmark Wwtp, WI (used) | 811 ft | May 6 | Oct 12 |
| Two Rivers, WI | 589 ft | Apr 27 | Oct 21 |
| Manitowoc, WI | 584 ft | Apr 30 | Oct 20 |
| Brillion, WI | 810 ft | May 6 | Oct 6 |
Frost dates near Maribel
- Kellnersville, WI 54215 · last May 6, first Oct 6
- Denmark, WI 54208 · last May 6, first Oct 12
- Francis Creek, WI 54214 · last Apr 27, first Oct 21
- Mishicot, WI 54228 · last Apr 27, first Oct 21
- Whitelaw, WI 54247 · last May 6, first Oct 6
- Tisch Mills, WI 54240 · last May 1, first Oct 18
- Greenleaf, WI 54126 · last May 6, first Oct 6
- Reedsville, WI 54230 · last May 6, first Oct 6
Frequently asked questions
- When is the last frost in Maribel, WI?
- For ZIP code 54227, the average last spring frost (32°F) is May 6, based on NOAA 1991-2020 climate normals for the Denmark Wwtp, WI weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Maribel, WI?
- The average first fall frost (32°F) is October 12. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 54227?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 158 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.