Frost dates for 54015Hammond, WI
The average last spring frost in Hammond is May 6 and the average first fall frost is October 2, giving a typical growing season of about 148 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 6
- Average first fall frost
- Oct 2
- Growing season
- 148 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 18 (1-in-10 risk)
Last frost typically in 186 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 3 · May 16 · May 29 | Sep 10 · Sep 24 · Oct 6 | 130 days | 100% |
| Frost / freeze (32°F) | Apr 21 · May 6 · May 21 | Sep 18 · Oct 2 · Oct 17 | 148 days | 100% |
| Hard freeze (28°F) | Apr 9 · Apr 26 · May 12 | Sep 26 · Oct 12 · Oct 28 | 169 days | 100% |
Planting calendar for Hammond
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 5 – Jun 11 |
| Tomatoes | Transplant outdoors | May 22 – Jun 12 |
| Peppers | Start seeds indoors | Apr 5 – May 6 |
| Peppers | Transplant outdoors | Jun 5 – Jul 6 |
| Eggplant | Start seeds indoors | Apr 22 – May 21 |
| Eggplant | Transplant outdoors | Jun 5 – Jul 6 |
| Cucumbers | Sow outdoors | Jun 5 – Jun 22 |
| Summer squash | Sow outdoors | May 22 – Jul 6 |
| Winter squash & pumpkins | Sow outdoors | Jun 5 – Jul 6 |
| Snap beans | Sow outdoors | May 22 – Jul 15 |
| Sweet corn | Sow outdoors | May 22 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 5 – Jul 6 |
| Okra | Sow outdoors | May 29 – Jun 21 |
| Peas | Sow outdoors (spring) | Apr 5 – May 21 |
| Potatoes | Plant outdoors (spring) | Apr 5 – Jun 5 |
| Onions | Start seeds indoors (spring) | Feb 22 – Mar 21 |
| Onions | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (spring) | Mar 18 – Apr 21 |
| Broccoli | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 8 – Apr 5 |
| Cabbage | Transplant outdoors (spring) | Apr 5 – May 6 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 5 – Jun 21 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Mar 29 – May 12 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 5 – May 26 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | Apr 22 – May 12 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 6 – Jun 21 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 54015 is matched to the NOAA station Baldwin, WI, 4.5 km away, at 1,100 ft elevation (17 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Baldwin, WI (used) | 1,100 ft | May 6 | Oct 2 |
| River Falls, WI | 940 ft | May 11 | Oct 1 |
| Ellsworth 1E, WI | 1,030 ft | May 13 | Sep 29 |
| Stillwater 1 Se, MN | 710 ft | Apr 22 | Oct 19 |
Frost dates near Hammond
- Baldwin, WI 54002 · last May 6, first Oct 2
- Roberts, WI 54023 · last May 11, first Oct 1
- Woodville, WI 54028 · last May 6, first Oct 2
- New Richmond, WI 54017 · last May 5, first Oct 4
- River Falls, WI 54022 · last May 11, first Oct 1
- Spring Valley, WI 54767 · last May 13, first Sep 29
- Wilson, WI 54027 · last May 6, first Oct 2
- Beldenville, WI 54003 · last May 13, first Sep 29
Frequently asked questions
- When is the last frost in Hammond, WI?
- For ZIP code 54015, the average last spring frost (32°F) is May 6, based on NOAA 1991-2020 climate normals for the Baldwin, WI weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Hammond, 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 54015?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 148 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.