When to plant in Rochester, MI
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Rochester, Michigan — is derived from the closest NOAA station with complete climate normals.
Zone 6a means Rochester sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average first fall frost in Rochester is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
PONTIAC 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 Rochester’s own odds, recorded at PONTIAC WWTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 5 | Apr 22 | Sep 28 | Oct 10 | Oct 23 |
| 32°F | May 12 | Apr 26 | Apr 15 | Oct 7 | Oct 22 | Nov 4 |
| 28°F | Apr 30 | Apr 16 | Apr 3 | Oct 20 | 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 Rochester, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Rochester planting FAQ
When is the last spring frost in Rochester, MI?
Rochester's average last spring frost falls near April 26 — 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 Rochester, MI?
Expect Rochester'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 Rochester in?
Rochester 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 Rochester?
There are roughly 179 frost-free days in Rochester (a moderate growing season), running from the average last frost around April 26 to the first fall frost near October 22.
When should I plant tomatoes in Rochester?
In Rochester, start tomato seeds indoors around March 1–March 15, then transplant seedlings outdoors around May 3 once the danger of frost has passed.
Never miss a window in Rochester
An email when it’s time to start seeds, transplant, and sow — timed to Rochester’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rochester Hills · 4 km
- Auburn Hills · 10 km
- Troy · 12 km
- Sterling Heights · 14 km
- Pontiac · 14 km
- Clawson · 17 km
- Birmingham · 18 km
- Madison Heights · 20 km
Frost dates recorded at PONTIAC WWTP, 12 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 Rochester, MI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00206658. Retrieved from https://blissgarden.com/michigan/rochester.