When to plant in South Lyon, MI
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in South Lyon, Michigan — is derived from the closest NOAA station with complete climate normals.
Zone 6a means South Lyon sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
WHITMORE LAKE 1NW · 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 South Lyon’s own odds, recorded at WHITMORE LAKE 1NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 31 | May 17 | May 1 | Sep 20 | Oct 1 | Oct 13 |
| 32°F | May 21 | May 5 | Apr 22 | Sep 30 | Oct 13 | Oct 26 |
| 28°F | May 10 | Apr 26 | Apr 12 | Oct 12 | Oct 26 | Nov 7 |
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 South Lyon, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
South Lyon planting FAQ
When is the last spring frost in South Lyon, MI?
Plan for the last spring frost in South Lyon around May 5 (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 South Lyon, MI?
In South Lyon, the first 32°F freeze of fall lands around October 13 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is South Lyon in?
South Lyon 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 South Lyon?
There are roughly 161 frost-free days in South Lyon (a moderate growing season), running from the average last frost around May 5 to the first fall frost near October 13.
When should I plant tomatoes in South Lyon?
In South Lyon, start tomato seeds indoors around March 10–March 24, then transplant seedlings outdoors around May 12 once the danger of frost has passed.
Never miss a window in South Lyon
An email when it’s time to start seeds, transplant, and sow — timed to South Lyon’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Wixom · 12 km
- Novi · 14 km
- Ann Arbor · 22 km
- Farmington · 23 km
- Farmington Hills · 23 km
- Livonia · 24 km
- Ypsilanti · 24 km
- Westland · 27 km
Frost dates recorded at WHITMORE LAKE 1NW, 11 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 South Lyon, MI — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00208972. Retrieved from https://blissgarden.com/michigan/south-lyon.