Frost dates for 54182Zachow, WI
The average last spring frost in Zachow is May 9 and the average first fall frost is October 2, giving a typical growing season of about 144 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 2
- Growing season
- 144 days
Safer after May 24 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 194 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 21 · Jun 3 | Sep 7 · Sep 22 · Oct 5 | 124 days | 100% |
| Frost / freeze (32°F) | Apr 26 · May 9 · May 24 | Sep 18 · Oct 2 · Oct 15 | 144 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 30 · May 15 | Sep 28 · Oct 13 · Oct 28 | 165 days | 100% |
Planting calendar for Zachow
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 12 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jun 22 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 15 |
| Sweet corn | Sow outdoors | May 25 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 54182 is matched to the NOAA station Shawano 2Ssw, WI, 19.9 km away, at 806 ft elevation (60 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Shawano 2Ssw, WI (used) | 806 ft | May 9 | Oct 2 |
| Suring, WI | 792 ft | May 14 | Oct 1 |
| Green Bay Botanical, WI | 694 ft | May 7 | Oct 9 |
| Clintonville, WI | 802 ft | May 4 | Oct 6 |
Frost dates near Zachow
- Bonduel, WI 54107 · last May 9, first Oct 2
- Krakow, WI 54137 · last May 14, first Oct 1
- Cecil, WI 54111 · last May 9, first Oct 2
- Green Valley, WI 54127 · last May 14, first Oct 1
- Pulaski, WI 54162 · last May 7, first Oct 9
- Gillett, WI 54124 · last May 14, first Oct 1
- Shawano, WI 54166 · last May 9, first Oct 2
- Nichols, WI 54152 · last May 4, first Oct 6
Frequently asked questions
- When is the last frost in Zachow, WI?
- For ZIP code 54182, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the Shawano 2Ssw, WI weather station. There is a 1-in-10 chance of a frost after May 24.
- When is the first frost in Zachow, WI?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 18, so tender plants are at risk from that point on.
- How long is the growing season in 54182?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 144 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.