Frost dates for 54149Mountain, WI
The average last spring frost in Mountain is May 22 and the average first fall frost is September 28, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 28
- Growing season
- 129 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 12 (1-in-10 risk)
Last frost typically in 207 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 21 · Jun 2 · Jun 17 | Sep 1 · Sep 16 · Sep 29 | 105 days | 100% |
| Frost / freeze (32°F) | May 7 · May 22 · Jun 3 | Sep 12 · Sep 28 · Oct 9 | 129 days | 100% |
| Hard freeze (28°F) | Apr 26 · May 9 · May 22 | Sep 24 · Oct 8 · Oct 22 | 151 days | 100% |
Planting calendar for Mountain
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 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 8 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 18 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 11 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 8 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | May 29 – Jun 8 |
| Broccoli | Transplant outdoors (fall) | Jun 28 – Jul 9 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 19 – Jun 18 |
| Cabbage | Transplant outdoors (fall) | Jun 18 – Jul 19 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 18 – Aug 4 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 5 – Aug 9 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 18 – Aug 19 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 11 – Jul 19 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 19 – Jul 4 |
| Garlic | Plant outdoors (fall) | Sep 18 – Oct 19 |
Where these dates come from
ZIP code 54149 is matched to the NOAA station Lakewood 3 Ne, WI, 15.2 km away, at 1,196 ft elevation (110 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Lakewood 3 Ne, WI (used) | 1,196 ft | May 22 | Sep 28 |
| Suring, WI | 792 ft | May 14 | Oct 1 |
| Crivitz High Falls, WI | 950 ft | May 26 | Sep 22 |
| Laona 6 Sw, WI | 1,695 ft | May 19 | Sep 29 |
Frost dates near Mountain
- Lakewood, WI 54138 · last May 22, first Sep 28
- Townsend, WI 54175 · last May 22, first Sep 28
- Suring, WI 54174 · last May 14, first Oct 1
- White Lake, WI 54491 · last May 22, first Sep 28
- Pound, WI 54161 · last May 14, first Oct 1
- Wabeno, WI 54566 · last May 19, first Sep 29
- Crivitz, WI 54114 · last May 26, first Sep 22
- Athelstane, WI 54104 · last May 26, first Sep 22
Frequently asked questions
- When is the last frost in Mountain, WI?
- For ZIP code 54149, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Lakewood 3 Ne, WI weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Mountain, WI?
- The average first fall frost (32°F) is September 28. There is a 1-in-10 chance of frost by September 12, so tender plants are at risk from that point on.
- How long is the growing season in 54149?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.