Sioux Falls, SD · zone 4b · ~158 frost-free days
When to plant in Sioux Falls: frost dates and zone 4b.
In Sioux Falls, the typical last spring frost lands around May 1 and the first fall frost around Oct 6, giving you about 158 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 Sioux Falls, 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 | Jul 23 to Sep 21 |
| Carrot | — | Mar 24 to Apr 26 | Jul 11 to Aug 6 |
| Bush Bean | — | May 1 to Jun 21 | Jun 22 to Jul 25 |
| Cucumber, slicing | — | May 8 to Jul 20 | — |
| Pepper, bell | Apr 5 to May 27 | May 17 to Jul 8 | — |
| Kale | Feb 10 to Mar 10 | Mar 24 to Apr 21 | Jul 6 to Aug 21 |
| Spinach | — | Mar 10 to Apr 21 | Jul 23 to Sep 10 |
Sioux Falls sits in Zone 4b, 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 Sioux Falls 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 57104 in about 60 seconds.
Sioux Falls planting questions
What planting zone is Sioux Falls, SD?+
Sioux Falls is in USDA hardiness zone 4b. Growing zone, gardening zone, and planting zone all mean the same thing: the USDA number, 4b 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 Sioux Falls?+
The typical last spring frost in Sioux Falls, SD 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 Sioux Falls?+
The typical first fall frost in Sioux Falls, SD arrives around Oct 6, closing a growing season of roughly 158 frost-free days. Count backward from it to find the last date a fall crop can still finish.
What can I plant now in Sioux Falls?+
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.