When to plant in Glendale, WI
USDA Zone 6aGlendale, 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 Glendale 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 Glendale’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 Glendale, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Glendale planting FAQ
When is the last spring frost in Glendale, WI?
Plan for the last spring frost in Glendale around April 26 (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 Glendale, WI?
Expect Glendale's first fall frost near October 18 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Glendale in?
Glendale 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 Glendale?
There are roughly 175 frost-free days in Glendale (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 Glendale?
In Glendale, 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 Glendale
An email when it’s time to start seeds, transplant, and sow — timed to Glendale’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Whitefish Bay · 3 km
- Shorewood · 5 km
- Brown Deer · 7 km
- Milwaukee · 8 km
- Wauwatosa · 11 km
- Mequon · 12 km
- West Allis · 16 km
- Menomonee Falls · 16 km
Frost dates recorded at MT MARY COLLEGE, 10 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 Glendale, WI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00475474. Retrieved from https://blissgarden.com/wisconsin/glendale.