When to plant in Ypsilanti, MI
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Ypsilanti, Michigan — is derived from the closest NOAA station with complete climate normals.
In zone 6a, Ypsilanti gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
ANN ARBOR SE · 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 Ypsilanti’s own odds, recorded at ANN ARBOR SE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 15 | May 1 | Sep 18 | Oct 1 | Oct 12 |
| 32°F | May 20 | May 5 | Apr 21 | Sep 28 | Oct 10 | Oct 24 |
| 28°F | May 11 | Apr 24 | Apr 10 | Oct 7 | Oct 23 | Nov 6 |
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 Ypsilanti, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 7 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.
Ypsilanti planting FAQ
When is the last spring frost in Ypsilanti, MI?
Ypsilanti's average last spring frost falls near May 5 — 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 Ypsilanti, MI?
Expect Ypsilanti's first fall frost near October 10 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Ypsilanti in?
Ypsilanti 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 Ypsilanti?
Ypsilanti has about 158 frost-free days — a moderate growing season — between the average last spring frost (May 5) and first fall frost (October 10).
When should I plant tomatoes in Ypsilanti?
For Ypsilanti, sow tomatoes indoors about March 10–March 24 and move the seedlings out around May 12, after the last spring frost.
Never miss a window in Ypsilanti
An email when it’s time to start seeds, transplant, and sow — timed to Ypsilanti’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Ann Arbor · 10 km
- Wayne · 20 km
- Romulus · 21 km
- Westland · 21 km
- South Lyon · 24 km
- Garden City · 25 km
- Inkster · 25 km
- Livonia · 27 km
Frost dates recorded at ANN ARBOR SE, 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 Ypsilanti, MI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00200228. Retrieved from https://blissgarden.com/michigan/ypsilanti.