When to plant in Oak Creek, WI
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Oak Creek, Wisconsin — all computed from Oak Creek's nearest NOAA weather station.
Zone 6a means Oak Creek sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
SOUTH MILWAUKEE WWTP · 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 Oak Creek’s own odds, recorded at SOUTH MILWAUKEE WWTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 5 | Apr 21 | Oct 1 | Oct 16 | Oct 28 |
| 32°F | May 8 | Apr 22 | Apr 9 | Oct 10 | Oct 26 | Nov 8 |
| 28°F | Apr 24 | Apr 9 | Mar 28 | Oct 24 | Nov 5 | Nov 20 |
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 Oak Creek, 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.
Oak Creek planting FAQ
When is the last spring frost in Oak Creek, WI?
Plan for the last spring frost in Oak Creek around April 22 (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 Oak Creek, WI?
Expect Oak Creek's first fall frost near October 26 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Oak Creek in?
Oak Creek 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 Oak Creek?
There are roughly 187 frost-free days in Oak Creek (a moderate growing season), running from the average last frost around April 22 to the first fall frost near October 26.
When should I plant tomatoes in Oak Creek?
In Oak Creek, start tomato seeds indoors around February 25–March 11, then transplant seedlings outdoors around April 29 once the danger of frost has passed.
Never miss a window in Oak Creek
An email when it’s time to start seeds, transplant, and sow — timed to Oak Creek’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- South Milwaukee · 5 km
- Cudahy · 8 km
- Caledonia · 9 km
- Franklin · 9 km
- Greendale · 11 km
- Greenfield · 13 km
- West Allis · 18 km
- Racine · 18 km
Frost dates recorded at SOUTH MILWAUKEE WWTP, 5 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 Oak Creek, WI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00477964. Retrieved from https://blissgarden.com/wisconsin/oak-creek.