When to plant in Harper Woods, MI
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in Harper Woods, Michigan — is derived from the closest NOAA station with complete climate normals.
In zone 6b, Harper Woods gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
GROSSE POINTE FARMS · 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 Harper Woods’s own odds, recorded at GROSSE POINTE FARMS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 8 | Apr 25 | Sep 26 | Oct 10 | Oct 24 |
| 32°F | May 13 | Apr 29 | Apr 15 | Oct 7 | Oct 22 | Nov 3 |
| 28°F | May 2 | Apr 16 | Apr 3 | Oct 19 | Nov 1 | Nov 14 |
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 Harper Woods, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Harper Woods planting FAQ
When is the last spring frost in Harper Woods, MI?
Plan for the last spring frost in Harper Woods around April 29 (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 Harper Woods, MI?
Expect Harper Woods's first fall frost near October 22 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Harper Woods in?
Harper Woods is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Harper Woods?
Harper Woods has about 176 frost-free days — a moderate growing season — between the average last spring frost (April 29) and first fall frost (October 22).
When should I plant tomatoes in Harper Woods?
For Harper Woods, sow tomatoes indoors about March 4–March 18 and move the seedlings out around May 6, after the last spring frost.
Never miss a window in Harper Woods
An email when it’s time to start seeds, transplant, and sow — timed to Harper Woods’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Grosse Pointe Woods · 2 km
- Eastpointe · 3 km
- St. Clair Shores · 7 km
- Grosse Pointe Park · 7 km
- Roseville · 8 km
- Warren · 10 km
- Fraser · 11 km
- Hamtramck · 11 km
Frost dates recorded at GROSSE POINTE FARMS, 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 Harper Woods, MI — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00203477. Retrieved from https://blissgarden.com/michigan/harper-woods.