Frost dates for 54201Algoma, WI
The average last spring frost in Algoma is May 6 and the average first fall frost is October 17, giving a typical growing season of about 163 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 6
- Average first fall frost
- Oct 17
- Growing season
- 163 days
Safer after May 20 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 186 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 6 · May 19 · Jun 2 | Sep 19 · Oct 3 · Oct 18 | 137 days | 100% |
| Frost / freeze (32°F) | Apr 22 · May 6 · May 20 | Oct 1 · Oct 17 · Nov 2 | 163 days | 100% |
| Hard freeze (28°F) | Apr 8 · Apr 23 · May 7 | Oct 16 · Nov 1 · Nov 13 | 189 days | 100% |
Planting calendar for Algoma
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 27 |
| 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 7 |
| Summer squash | Sow outdoors | May 22 – Jul 6 |
| Winter squash & pumpkins | Sow outdoors | Jun 5 – Jul 6 |
| Snap beans | Sow outdoors | May 22 – Jul 30 |
| Sweet corn | Sow outdoors | May 22 – Jun 27 |
| 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 17 – Jun 27 |
| Broccoli | Transplant outdoors (fall) | Jul 17 – Jul 28 |
| Cabbage | Start seeds indoors (spring) | Mar 8 – Apr 5 |
| Cabbage | Transplant outdoors (spring) | Apr 5 – May 6 |
| Cabbage | Start seeds indoors (fall) | Jun 7 – Jul 7 |
| Cabbage | Transplant outdoors (fall) | Jul 7 – Aug 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 5 – Jun 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 7 – Aug 23 |
| Spinach | Sow outdoors (spring) | Mar 29 – May 12 |
| Spinach | Sow outdoors (fall) | Jul 24 – Aug 28 |
| Radishes | Sow outdoors (spring) | Apr 5 – May 26 |
| Radishes | Sow outdoors (fall) | Jul 7 – Sep 7 |
| Kale | Sow outdoors (spring) | Apr 22 – May 12 |
| Kale | Sow outdoors (fall) | Jun 30 – Aug 7 |
| Carrots | Sow outdoors (spring) | May 6 – Jun 21 |
| Carrots | Sow outdoors (fall) | Jun 7 – Jul 23 |
| Garlic | Plant outdoors (fall) | Oct 7 – Nov 7 |
Where these dates come from
ZIP code 54201 is matched to the NOAA station Forestville-4E, WI, 11.1 km away, at 690 ft elevation (76 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Forestville-4E, WI (used) | 690 ft | May 6 | Oct 17 |
| Kewaunee, WI | 593 ft | May 1 | Oct 18 |
| Sturgeon Bay Exp Farm, WI | 699 ft | May 8 | Oct 13 |
| Denmark Wwtp, WI | 811 ft | May 6 | Oct 12 |
Frost dates near Algoma
- Forestville, WI 54213 · last May 6, first Oct 17
- Casco, WI 54205 · last May 1, first Oct 18
- Maplewood, WI 54226 · last May 6, first Oct 17
- Brussels, WI 54204 · last May 6, first Oct 17
- Kewaunee, WI 54216 · last May 1, first Oct 18
- Luxemburg, WI 54217 · last May 1, first Oct 18
- Sturgeon Bay, WI 54235 · last May 8, first Oct 13
- New Franken, WI 54229 · last May 7, first Oct 9
Frequently asked questions
- When is the last frost in Algoma, WI?
- For ZIP code 54201, the average last spring frost (32°F) is May 6, based on NOAA 1991-2020 climate normals for the Forestville-4E, WI weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Algoma, WI?
- The average first fall frost (32°F) is October 17. 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 54201?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 163 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.