Frost dates for 54836Foxboro, WI
The average last spring frost in Foxboro is May 18 and the average first fall frost is October 3, giving a typical growing season of about 135 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 18
- Average first fall frost
- Oct 3
- Growing season
- 135 days
Safer after Jun 3 (1-in-10 risk)
Possible by Sep 20 (1-in-10 risk)
Last frost typically in 196 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 18 · May 31 · Jun 13 | Sep 10 · Sep 24 · Oct 6 | 114 days | 100% |
| Frost / freeze (32°F) | May 4 · May 18 · Jun 3 | Sep 20 · Oct 3 · Oct 16 | 135 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 5 · May 21 | Sep 30 · Oct 14 · Oct 30 | 160 days | 100% |
Planting calendar for Foxboro
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 17 – Jun 23 |
| Tomatoes | Transplant outdoors | Jun 3 – Jun 13 |
| Peppers | Start seeds indoors | Apr 17 – May 18 |
| Peppers | Transplant outdoors | Jun 17 – Jul 18 |
| Eggplant | Start seeds indoors | May 4 – Jun 2 |
| Eggplant | Transplant outdoors | Jun 17 – Jul 18 |
| Cucumbers | Sow outdoors | Jun 17 – Jun 23 |
| Summer squash | Sow outdoors | Jun 3 – Jul 18 |
| Winter squash & pumpkins | Sow outdoors | Jun 17 – Jul 18 |
| Snap beans | Sow outdoors | Jun 3 – Jul 16 |
| Sweet corn | Sow outdoors | Jun 3 – Jun 13 |
| Watermelon & cantaloupe | Sow outdoors | Jun 17 – Jul 18 |
| Okra | Sow outdoors | Jun 10 – Jul 3 |
| Peas | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Potatoes | Plant outdoors (spring) | Apr 17 – Jun 17 |
| Onions | Start seeds indoors (spring) | Mar 6 – Apr 2 |
| Onions | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (spring) | Mar 30 – May 3 |
| Broccoli | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (fall) | Jun 3 – Jun 13 |
| Broccoli | Transplant outdoors (fall) | Jul 3 – Jul 14 |
| Cabbage | Start seeds indoors (spring) | Mar 20 – Apr 17 |
| Cabbage | Transplant outdoors (spring) | Apr 17 – May 18 |
| Cabbage | Start seeds indoors (fall) | May 24 – Jun 23 |
| Cabbage | Transplant outdoors (fall) | Jun 23 – Jul 24 |
| Leaf lettuce | Sow outdoors (spring) | Apr 17 – Jul 3 |
| Leaf lettuce | Sow outdoors (fall) | Jun 23 – Aug 9 |
| Spinach | Sow outdoors (spring) | Apr 10 – May 24 |
| Spinach | Sow outdoors (fall) | Jul 10 – Aug 14 |
| Radishes | Sow outdoors (spring) | Apr 17 – Jun 7 |
| Radishes | Sow outdoors (fall) | Jun 23 – Aug 24 |
| Kale | Sow outdoors (spring) | May 4 – May 24 |
| Kale | Sow outdoors (fall) | Jun 16 – Jul 24 |
| Carrots | Sow outdoors (spring) | May 18 – Jul 3 |
| Carrots | Sow outdoors (fall) | May 24 – Jul 9 |
| Garlic | Plant outdoors (fall) | Sep 23 – Oct 24 |
Where these dates come from
ZIP code 54836 is matched to the NOAA station Pattison Ranger Staion, WI, 6 km away, at 1,100 ft elevation (94 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pattison Ranger Staion, WI (used) | 1,100 ft | May 18 | Oct 3 |
| Foxboro, WI | 932 ft | Jun 1 | Sep 22 |
| Superior, WI | 607 ft | May 6 | Oct 9 |
| Solon Springs, WI | 1,130 ft | May 12 | Oct 2 |
Frost dates near Foxboro
- Holyoke, MN 55749 · last Jun 1, first Sep 22
- South Range, WI 54874 · last May 18, first Oct 3
- Wrenshall, MN 55797 · last Jun 1, first Sep 22
- Hawthorne, WI 54842 · last May 12, first Oct 2
- Duluth, MN 55808 · last May 6, first Oct 9
- Superior, WI 54880 · last May 6, first Oct 9
- Poplar, WI 54864 · last May 24, first Sep 26
- Solon Springs, WI 54873 · last May 12, first Oct 2
Frequently asked questions
- When is the last frost in Foxboro, WI?
- For ZIP code 54836, the average last spring frost (32°F) is May 18, based on NOAA 1991-2020 climate normals for the Pattison Ranger Staion, WI weather station. There is a 1-in-10 chance of a frost after June 3.
- When is the first frost in Foxboro, WI?
- The average first fall frost (32°F) is October 3. There is a 1-in-10 chance of frost by September 20, so tender plants are at risk from that point on.
- How long is the growing season in 54836?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 135 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.