Frost dates for 53130Hales Corners, WI
The average last spring frost in Hales Corners is May 3 and the average first fall frost is October 14, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 3
- Average first fall frost
- Oct 14
- Growing season
- 162 days
Safer after May 19 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 181 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) | Apr 30 · May 14 · May 29 | Sep 22 · Oct 3 · Oct 15 | 141 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 3 · May 19 | Sep 30 · Oct 14 · Oct 26 | 162 days | 100% |
| Hard freeze (28°F) | Apr 8 · Apr 21 · May 9 | Oct 8 · Oct 24 · Nov 6 | 183 days | 100% |
Planting calendar for Hales Corners
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 2 – Jun 8 |
| Tomatoes | Transplant outdoors | May 19 – Jun 24 |
| Peppers | Start seeds indoors | Apr 2 – May 3 |
| Peppers | Transplant outdoors | Jun 2 – Jul 3 |
| Eggplant | Start seeds indoors | Apr 19 – May 18 |
| Eggplant | Transplant outdoors | Jun 2 – Jul 3 |
| Cucumbers | Sow outdoors | Jun 2 – Jul 4 |
| Summer squash | Sow outdoors | May 19 – Jul 3 |
| Winter squash & pumpkins | Sow outdoors | Jun 2 – Jul 3 |
| Snap beans | Sow outdoors | May 19 – Jul 27 |
| Sweet corn | Sow outdoors | May 19 – Jun 24 |
| Watermelon & cantaloupe | Sow outdoors | Jun 2 – Jul 3 |
| Okra | Sow outdoors | May 26 – Jun 18 |
| Peas | Sow outdoors (spring) | Apr 2 – May 18 |
| Potatoes | Plant outdoors (spring) | Apr 2 – Jun 2 |
| Onions | Start seeds indoors (spring) | Feb 19 – Mar 18 |
| Onions | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (spring) | Mar 15 – Apr 18 |
| Broccoli | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (fall) | Jun 14 – Jun 24 |
| Broccoli | Transplant outdoors (fall) | Jul 14 – Jul 25 |
| Cabbage | Start seeds indoors (spring) | Mar 5 – Apr 2 |
| Cabbage | Transplant outdoors (spring) | Apr 2 – May 3 |
| Cabbage | Start seeds indoors (fall) | Jun 4 – Jul 4 |
| Cabbage | Transplant outdoors (fall) | Jul 4 – Aug 4 |
| Leaf lettuce | Sow outdoors (spring) | Apr 2 – Jun 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 4 – Aug 20 |
| Spinach | Sow outdoors (spring) | Mar 26 – May 9 |
| Spinach | Sow outdoors (fall) | Jul 21 – Aug 25 |
| Radishes | Sow outdoors (spring) | Apr 2 – May 23 |
| Radishes | Sow outdoors (fall) | Jul 4 – Sep 4 |
| Kale | Sow outdoors (spring) | Apr 19 – May 9 |
| Kale | Sow outdoors (fall) | Jun 27 – Aug 4 |
| Carrots | Sow outdoors (spring) | May 3 – Jun 18 |
| Carrots | Sow outdoors (fall) | Jun 4 – Jul 20 |
| Garlic | Plant outdoors (fall) | Oct 4 – Nov 4 |
Where these dates come from
ZIP code 53130 is matched to the NOAA station Hales Corners/Whitnall Park/Bo, WI, 1.7 km away, at 774 ft elevation (17 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hales Corners/Whitnall Park/Bo, WI (used) | 774 ft | May 3 | Oct 14 |
| West Allis, WI | 723 ft | Apr 26 | Oct 22 |
| Milwaukee Mitchell Ap, WI | 670 ft | Apr 19 | Oct 29 |
| Mt Mary College, WI | 715 ft | Apr 26 | Oct 18 |
Frost dates near Hales Corners
- Milwaukee, WI 53228 · last Apr 26, first Oct 18
- Greendale, WI 53129 · last Apr 19, first Oct 29
- Franklin, WI 53132 · last Apr 19, first Oct 29
- New Berlin, WI 53151 · last May 1, first Oct 13
- Muskego, WI 53150 · last May 1, first Oct 13
- Elm Grove, WI 53122 · last Apr 26, first Oct 18
- Oak Creek, WI 53154 · last Apr 19, first Oct 29
- Brookfield, WI 53005 · last Apr 26, first Oct 18
Frequently asked questions
- When is the last frost in Hales Corners, WI?
- For ZIP code 53130, the average last spring frost (32°F) is May 3, based on NOAA 1991-2020 climate normals for the Hales Corners/Whitnall Park/Bo, WI weather station. There is a 1-in-10 chance of a frost after May 19.
- When is the first frost in Hales Corners, WI?
- The average first fall frost (32°F) is October 14. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 53130?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.