When to plant in Flint, MI
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Flint, Michigan — is derived from the closest NOAA station with complete climate normals.
Zone 6a means Flint sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
FLINT 7W · 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 Flint’s own odds, recorded at FLINT 7W.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 14 | Apr 29 | Sep 20 | Oct 2 | Oct 13 |
| 32°F | May 20 | May 3 | Apr 20 | Sep 30 | Oct 13 | Oct 27 |
| 28°F | May 9 | Apr 22 | Apr 8 | Oct 12 | Oct 27 | 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 Flint, 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.
Flint planting FAQ
When is the last spring frost in Flint, MI?
On average, the last spring frost in Flint is around May 3 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Flint, MI?
Expect Flint's first fall frost near October 13 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Flint in?
Flint 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 Flint?
There are roughly 163 frost-free days in Flint (a moderate growing season), running from the average last frost around May 3 to the first fall frost near October 13.
When should I plant tomatoes in Flint?
In Flint, start tomato seeds indoors around March 8–March 22, then transplant seedlings outdoors around May 10 once the danger of frost has passed.
Never miss a window in Flint
An email when it’s time to start seeds, transplant, and sow — timed to Flint’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at FLINT 7W, 6 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 Flint, MI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00202851. Retrieved from https://blissgarden.com/michigan/flint.