Sisseton Municipal Airport, SD Frost Dates & Growing Season

The two dates every Sisseton Municipal Airport garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 3
~50% chance of frost after
First fall frost
Sep 30
~50% chance of frost before
Growing season
150 days
frost-free stretch
USDA zone
≈ 4b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 21 May 3 May 16
First fall frost Oct 13 Sep 30 Sep 17
Hard freeze (28°F), median last Apr 24 · first Oct 10

Computed from NOAA 1991–2020 climate normals at the SISSETON MUNI AP station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Sisseton Municipal Airport

Computed from Sisseton Municipal Airport's own frost dates. Click any crop for the full zone-4 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 8 – Mar 22 May 10 – May 17
🫑 Peppers Feb 22 – Mar 8 May 17 – May 24
🥬 Lettuce Mar 22 – Apr 5 Apr 5 – Apr 19 Apr 5 – May 3
🫛 Peas Mar 22 – Apr 5
🥕 Carrots Apr 12 – May 3
🥦 Broccoli Mar 15 – Mar 29 Apr 12 – Apr 26
🥬 Kale Mar 22 – Apr 5 Apr 5 – Apr 19 Apr 5 – Apr 19
🥒 Cucumbers Apr 5 – Apr 12 May 10 – May 17 May 10 – May 17
🥒 Zucchini Apr 5 – Apr 12 May 10 – May 17 May 10 – May 17
🫘 Green Beans (Bush) May 10 – May 17
🌽 Sweet Corn May 10 – May 17
🌿 Basil Mar 22 – Apr 5 May 10 – May 17 May 17 – May 24
🧄 Garlic Fall: Aug 19 – Sep 16

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Sisseton Municipal Airport's dates automatically after a lookup.

Reading the season in Sisseton Municipal Airport

Roughly 150 frost-free days gives Sisseton Municipal Airport gardeners room for nearly every common vegetable. Warm-season crops go out after May 3; a fall garden sown in late summer matures comfortably before the Sep 30 frost.

Frequently asked questions

When is the last frost in Sisseton Municipal Airport, SD?

The average last spring frost in Sisseton Municipal Airport is around May 3, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Sisseton Municipal Airport, SD?

The average first fall frost in Sisseton Municipal Airport arrives around Sep 30. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Sisseton Municipal Airport?

About 150 frost-free days on average, from May 3 to Sep 30. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Sisseton Municipal Airport in?

USDA zone 4b on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.