When to plant in Allouez, WI
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Allouez, Wisconsin — all computed from Allouez's nearest NOAA weather station.
Zone 5b means Allouez sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average first fall frost in Allouez is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
GREEN BAY · 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 Allouez’s own odds, recorded at GREEN BAY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 27 | May 13 | Apr 29 | Sep 16 | Sep 29 | Oct 12 |
| 32°F | May 16 | Apr 30 | Apr 16 | Sep 24 | Oct 9 | Oct 26 |
| 28°F | May 4 | Apr 17 | Apr 3 | Oct 6 | Oct 24 | Nov 9 |
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 Allouez, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 9 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.
Allouez planting FAQ
When is the last spring frost in Allouez, WI?
Plan for the last spring frost in Allouez around April 30 (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 Allouez, WI?
In Allouez, the first 32°F freeze of fall lands around October 9 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Allouez in?
Allouez 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 Allouez?
There are roughly 162 frost-free days in Allouez (a moderate growing season), running from the average last frost around April 30 to the first fall frost near October 9.
When should I plant tomatoes in Allouez?
In Allouez, start tomato seeds indoors around March 5–March 19, then transplant seedlings outdoors around May 7 once the danger of frost has passed.
Never miss a window in Allouez
An email when it’s time to start seeds, transplant, and sow — timed to Allouez’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at GREEN BAY, 7 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 Allouez, WI — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014898. Retrieved from https://blissgarden.com/wisconsin/allouez.