When to plant in Marinette, WI
USDA Zone 5bMarinette, 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 5b, Marinette gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
MARINETTE · 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 Marinette’s own odds, recorded at MARINETTE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 16 | May 1 | Sep 20 | Oct 1 | Oct 13 |
| 32°F | May 20 | May 4 | Apr 19 | Sep 29 | Oct 11 | Oct 29 |
| 28°F | May 10 | Apr 22 | Apr 7 | Oct 9 | Oct 27 | Nov 10 |
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 Marinette, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 33 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.
Marinette planting FAQ
When is the last spring frost in Marinette, WI?
Marinette's average last spring frost falls near May 4 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Marinette, WI?
In Marinette, the first 32°F freeze of fall lands around October 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Marinette in?
Marinette 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 Marinette?
Marinette has about 160 frost-free days — a moderate growing season — between the average last spring frost (May 4) and first fall frost (October 11).
When should I plant tomatoes in Marinette?
For Marinette, sow tomatoes indoors about March 9–March 23 and move the seedlings out around May 11, after the last spring frost.
Never miss a window in Marinette
An email when it’s time to start seeds, transplant, and sow — timed to Marinette’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at MARINETTE, 1 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 Marinette, WI — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00475091. Retrieved from https://blissgarden.com/wisconsin/marinette.