When to plant in Ionia, MI
USDA Zone 6aIonia, Michigan frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 6a, Ionia gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Ionia is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
IONIA 2SSW · 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 Ionia’s own odds, recorded at IONIA 2SSW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 1 | May 16 | Apr 30 | Sep 18 | Oct 1 | Oct 15 |
| 32°F | May 21 | May 3 | Apr 17 | Sep 29 | Oct 12 | Oct 27 |
| 28°F | May 9 | Apr 22 | Apr 7 | Oct 7 | 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 Ionia, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 39 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.
Ionia planting FAQ
When is the last spring frost in Ionia, MI?
Plan for the last spring frost in Ionia around May 3 (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 Ionia, MI?
Expect Ionia's first fall frost near October 12 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Ionia in?
Ionia 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 Ionia?
Ionia has about 162 frost-free days — a moderate growing season — between the average last spring frost (May 3) and first fall frost (October 12).
When should I plant tomatoes in Ionia?
For Ionia, sow tomatoes indoors about March 8–March 22 and move the seedlings out around May 10, after the last spring frost.
Never miss a window in Ionia
An email when it’s time to start seeds, transplant, and sow — timed to Ionia’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Forest Hills · 34 km
- Kentwood · 43 km
- East Grand Rapids · 43 km
- Northview · 44 km
- Waverly · 45 km
- Grand Rapids · 47 km
- Comstock Park · 49 km
- Lansing · 51 km
Frost dates recorded at IONIA 2SSW, 3 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 Ionia, MI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00204078. Retrieved from https://blissgarden.com/michigan/ionia.