When to plant in Muskego, WI
USDA Zone 5bMuskego, Wisconsin frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 5b, Muskego gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
HALES CORNERS/WHITNALL PARK/BO · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Muskego’s own odds, recorded at HALES CORNERS/WHITNALL PARK/BO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 14 | Apr 30 | Sep 22 | Oct 3 | Oct 15 |
| 32°F | May 19 | May 3 | Apr 18 | Sep 30 | Oct 14 | Oct 26 |
| 28°F | May 9 | Apr 21 | Apr 8 | Oct 8 | Oct 24 | Nov 6 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Muskego, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Muskego planting FAQ
When is the last spring frost in Muskego, WI?
Plan for the last spring frost in Muskego around May 3 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Muskego, WI?
The first fall frost in Muskego typically arrives around October 14 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Muskego in?
Muskego is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Muskego?
Muskego has about 164 frost-free days — a moderate growing season — between the average last spring frost (May 3) and first fall frost (October 14).
When should I plant tomatoes in Muskego?
For Muskego, sow tomatoes indoors about March 8–March 22 and move the seedlings out around May 10, after the last spring frost.
Never miss a window in Muskego
An email when it’s time to start seeds, transplant, and sow — timed to Muskego’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Franklin · 10 km
- New Berlin · 11 km
- Greendale · 13 km
- Greenfield · 14 km
- West Allis · 17 km
- Waukesha · 18 km
- Oak Creek · 19 km
- Brookfield · 21 km
Frost dates recorded at HALES CORNERS/WHITNALL PARK/BO, 11 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Muskego, WI — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00473391. Retrieved from https://blissgarden.com/wisconsin/muskego.