When to plant in Whitefish Bay, WI
USDA Zone 6aWhitefish Bay, Wisconsin frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 6a means Whitefish Bay sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
MT MARY COLLEGE · 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 Whitefish Bay’s own odds, recorded at MT MARY COLLEGE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 8 | Apr 24 | Sep 25 | Oct 6 | Oct 22 |
| 32°F | May 12 | Apr 26 | Apr 12 | Oct 2 | Oct 18 | Nov 1 |
| 28°F | Apr 30 | Apr 14 | Apr 1 | Oct 13 | Oct 30 | Nov 11 |
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 Whitefish Bay, 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.
Whitefish Bay planting FAQ
When is the last spring frost in Whitefish Bay, WI?
On average, the last spring frost in Whitefish Bay is around April 26 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Whitefish Bay, WI?
In Whitefish Bay, the first 32°F freeze of fall lands around October 18 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Whitefish Bay in?
Whitefish Bay is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Whitefish Bay?
There are roughly 175 frost-free days in Whitefish Bay (a moderate growing season), running from the average last frost around April 26 to the first fall frost near October 18.
When should I plant tomatoes in Whitefish Bay?
In Whitefish Bay, start tomato seeds indoors around March 1–March 15, then transplant seedlings outdoors around May 3 once the danger of frost has passed.
Never miss a window in Whitefish Bay
An email when it’s time to start seeds, transplant, and sow — timed to Whitefish Bay’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Glendale · 3 km
- Shorewood · 3 km
- Milwaukee · 8 km
- Brown Deer · 9 km
- Wauwatosa · 12 km
- Mequon · 14 km
- West Allis · 16 km
- Brookfield · 18 km
Frost dates recorded at MT MARY COLLEGE, 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 Whitefish Bay, WI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00475474. Retrieved from https://blissgarden.com/wisconsin/whitefish-bay.