When to plant in Caledonia, WI
USDA Zone 6aCaledonia, 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 6a, Caledonia gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
RACINE BATTEN AP · 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 Caledonia’s own odds, recorded at RACINE BATTEN AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 23 | May 7 | Apr 23 | Sep 30 | Oct 13 | Oct 26 |
| 32°F | May 10 | Apr 24 | Apr 11 | Oct 10 | Oct 24 | Nov 5 |
| 28°F | Apr 25 | Apr 11 | Mar 30 | Oct 23 | Nov 4 | Nov 17 |
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 Caledonia, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Caledonia planting FAQ
When is the last spring frost in Caledonia, WI?
Plan for the last spring frost in Caledonia around April 24 (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 Caledonia, WI?
Expect Caledonia's first fall frost near October 24 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Caledonia in?
Caledonia 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 Caledonia?
Caledonia has about 183 frost-free days — a moderate growing season — between the average last spring frost (April 24) and first fall frost (October 24).
When should I plant tomatoes in Caledonia?
For Caledonia, sow tomatoes indoors about February 27–March 13 and move the seedlings out around May 1, after the last spring frost.
Never miss a window in Caledonia
An email when it’s time to start seeds, transplant, and sow — timed to Caledonia’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Oak Creek · 9 km
- Racine · 10 km
- Mount Pleasant · 10 km
- South Milwaukee · 13 km
- Franklin · 15 km
- Cudahy · 17 km
- Greendale · 19 km
- Greenfield · 21 km
Frost dates recorded at RACINE BATTEN AP, 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 Caledonia, WI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094818. Retrieved from https://blissgarden.com/wisconsin/caledonia.