Frost dates for 54874South Range, WI
The average last spring frost in South Range 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 South Range
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 54874 is matched to the NOAA station Pattison Ranger Staion, WI, 14.5 km away, at 1,100 ft elevation (119 ft higher 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 |
| Superior, WI | 607 ft | May 6 | Oct 9 |
| Solon Springs, WI | 1,130 ft | May 12 | Oct 2 |
| Duluth Harbor Stn, MN | 610 ft | May 14 | Oct 12 |
Frost dates near South Range
- Poplar, WI 54864 · last May 24, first Sep 26
- Hawthorne, WI 54842 · last May 12, first Oct 2
- Lake Nebagamon, WI 54849 · last May 12, first Oct 2
- Foxboro, WI 54836 · last May 18, first Oct 3
- Maple, WI 54854 · last May 24, first Sep 26
- Superior, WI 54880 · last May 6, first Oct 9
- Solon Springs, WI 54873 · last May 12, first Oct 2
- Duluth, MN 55802 · last May 6, first Oct 9
Frequently asked questions
- When is the last frost in South Range, WI?
- For ZIP code 54874, 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 South Range, 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 54874?
- 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.