Frost dates for 54875Springbrook, WI
The average last spring frost in Springbrook is May 22 and the average first fall frost is September 23, giving a typical growing season of about 124 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 23
- Growing season
- 124 days
Safer after Jun 6 (1-in-10 risk)
Possible by Sep 3 (1-in-10 risk)
Last frost typically in 201 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 17 · Jun 4 · Jun 24 | Aug 26 · Sep 12 · Oct 1 | 98 days | 100% |
| Frost / freeze (32°F) | May 2 · May 22 · Jun 6 | Sep 3 · Sep 23 · Oct 9 | 124 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 8 · May 27 | Sep 15 · Oct 3 · Oct 21 | 146 days | 100% |
Planting calendar for Springbrook
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 3 |
| 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 13 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 6 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 3 |
| 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 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 54875 is matched to the NOAA station Hayward Rs, WI, 14.3 km away, at 1,200 ft elevation (22 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hayward Rs, WI (used) | 1,200 ft | May 22 | Sep 23 |
| Hayward Muni Ap, WI | 1,204 ft | May 23 | Sep 22 |
| Minong 5 Wsw, WI | 1,075 ft | May 10 | Oct 4 |
| Spooner Ag Res Stn, WI | 1,100 ft | May 14 | Sep 28 |
Frost dates near Springbrook
- Trego, WI 54888 · last May 14, first Sep 28
- Stone Lake, WI 54876 · last —, first —
- Spooner, WI 54801 · last May 14, first Sep 28
- Minong, WI 54859 · last May 22, first Sep 26
- Wascott, WI 54890 · last May 22, first Sep 26
- Sarona, WI 54870 · last May 14, first Sep 28
- Edgewater, WI 54834 · last —, first —
- Shell Lake, WI 54871 · last May 14, first Sep 28
Frequently asked questions
- When is the last frost in Springbrook, WI?
- For ZIP code 54875, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Hayward Rs, WI weather station. There is a 1-in-10 chance of a frost after June 6.
- When is the first frost in Springbrook, WI?
- The average first fall frost (32°F) is September 23. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.
- How long is the growing season in 54875?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 124 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.