Grand Rapids, MI · zone 6a · ~169 frost-free days
When to plant in Grand Rapids: frost dates and zone 6a.
In Grand Rapids, the typical last spring frost lands around May 1 and the first fall frost around Oct 17, giving you about 169 frost-free days. Cool-season crops go out before the last frost; warm-season crops wait until after it.
The 2026 windows
Sow dates for Grand Rapids, keyed to your frost.
| Crop | Start indoors | Spring sow / set out | Fall sow |
|---|---|---|---|
| Tomato, slicing | Mar 27 to May 27 | May 8 to Jul 8 | — |
| Lettuce, leaf | — | Mar 24 to May 8 | Aug 3 to Oct 2 |
| Carrot | — | Mar 24 to Apr 26 | Jul 22 to Aug 17 |
| Bush Bean | — | May 1 to Jun 21 | Jul 3 to Aug 5 |
| Cucumber, slicing | — | May 8 to Jul 31 | — |
| Pepper, bell | Apr 5 to May 27 | May 17 to Jul 8 | — |
| Kale | Feb 10 to Mar 10 | Mar 24 to Apr 21 | Jul 17 to Sep 1 |
| Spinach | — | Mar 10 to Apr 21 | Aug 3 to Sep 21 |
Grand Rapids sits in Zone 6a, but two gardens in the same city can be a week or two apart. The planner works from your ZIP code's frost dates, not the zone, so the dates land right for your block, not the metro average.
Build your Grand Rapids garden plan.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for ZIP 49503 in about 60 seconds.
Grand Rapids planting questions
What planting zone is Grand Rapids, MI?+
Grand Rapids is in USDA hardiness zone 6a. Growing zone, gardening zone, and planting zone all mean the same thing: the USDA number, 6a here. It tells you what survives winter, not when to plant. Frost dates set your planting time, and the free planner uses your exact ZIP code's frost dates, which can differ by weeks across one metro.
When is the last frost date in Grand Rapids?+
The typical last spring frost in Grand Rapids, MI is around May 1. That is an average from local history, not a guarantee, so tender crops like tomatoes and peppers are safer with a week of buffer after it.
When is the first frost date in Grand Rapids?+
The typical first fall frost in Grand Rapids, MI arrives around Oct 17, closing a growing season of roughly 169 frost-free days. Count backward from it to find the last date a fall crop can still finish.
What can I plant now in Grand Rapids?+
It depends on the date. Cool-season crops like lettuce, kale, and spinach go out weeks before the last frost; warm-season crops like tomatoes and peppers wait until after May 1. The table above shows each crop's window; the free planner turns your ZIP into an exact, dated calendar.