Wentworth 2.5 WNW, SD Frost Dates & Growing Season

The two dates every Wentworth 2.5 WNW garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 2
~50% chance of frost after
First fall frost
Oct 5
~50% chance of frost before
Growing season
156 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 18 May 2 May 14
First fall frost Oct 19 Oct 5 Sep 24
Hard freeze (28°F), median last Apr 22 · first Oct 16

Computed from NOAA 1991–2020 climate normals at the WENTWORTH 2.5 WNW 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 Wentworth 2.5 WNW

Computed from Wentworth 2.5 WNW'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 7 – Mar 21 May 9 – May 16
🫑 Peppers Feb 21 – Mar 7 May 16 – May 23
🥬 Lettuce Mar 21 – Apr 4 Apr 4 – Apr 18 Apr 4 – May 2
🫛 Peas Mar 21 – Apr 4
🥕 Carrots Apr 11 – May 2
🥦 Broccoli Mar 14 – Mar 28 Apr 11 – Apr 25
🥬 Kale Mar 21 – Apr 4 Apr 4 – Apr 18 Apr 4 – Apr 18
🥒 Cucumbers Apr 4 – Apr 11 May 9 – May 16 May 9 – May 16
🥒 Zucchini Apr 4 – Apr 11 May 9 – May 16 May 9 – May 16
🫘 Green Beans (Bush) May 9 – May 16
🌽 Sweet Corn May 9 – May 16
🌿 Basil Mar 21 – Apr 4 May 9 – May 16 May 16 – May 23
🧄 Garlic Fall: Aug 24 – Sep 21

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 Wentworth 2.5 WNW's dates automatically after a lookup.

Reading the season in Wentworth 2.5 WNW

Roughly 156 frost-free days gives Wentworth 2.5 WNW gardeners room for nearly every common vegetable. Warm-season crops go out after May 2; a fall garden sown in late summer matures comfortably before the Oct 5 frost.

Frequently asked questions

When is the last frost in Wentworth 2.5 WNW, SD?

The average last spring frost in Wentworth 2.5 WNW is around May 2, 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 Wentworth 2.5 WNW, SD?

The average first fall frost in Wentworth 2.5 WNW arrives around Oct 5. 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 Wentworth 2.5 WNW?

About 156 frost-free days on average, from May 2 to Oct 5. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Wentworth 2.5 WNW 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.