Wanship Dam, UT Frost Dates & Growing Season

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

Last spring frost
Jun 11
~50% chance of frost after
First fall frost
Sep 12
~50% chance of frost before
Growing season
93 days
frost-free stretch
USDA zone
≈ 4b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 21 Jun 11 Jun 30
First fall frost Sep 27 Sep 12 Aug 28
Hard freeze (28°F), median last May 26 · first Sep 23

Computed from NOAA 1991–2020 climate normals at the WANSHIP DAM 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 Wanship Dam

Computed from Wanship Dam'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 Apr 16 – Apr 30 Jun 18 – Jun 25
🫑 Peppers Apr 2 – Apr 16 Jun 25 – Jul 2
🥬 Lettuce Apr 30 – May 14 May 14 – May 28 May 14 – Jun 11
🫛 Peas Apr 30 – May 14
🥕 Carrots May 21 – Jun 11
🥦 Broccoli Apr 23 – May 7 May 21 – Jun 4
🥬 Kale Apr 30 – May 14 May 14 – May 28 May 14 – May 28
🥒 Cucumbers May 14 – May 21 Jun 18 – Jun 25 Jun 18 – Jun 25
🥒 Zucchini May 14 – May 21 Jun 18 – Jun 25 Jun 18 – Jun 25
🫘 Green Beans (Bush) Jun 18 – Jun 25
🌽 Sweet Corn Jun 18 – Jun 25
🌿 Basil Apr 30 – May 14 Jun 18 – Jun 25 Jun 25 – Jul 2
🧄 Garlic Fall: Aug 1 – Aug 29

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 Wanship Dam's dates automatically after a lookup.

Reading the season in Wanship Dam

At about 93 frost-free days, Wanship Dam rewards efficiency: start warm-season crops indoors, favor short-season varieties, and lean on cold-tolerant crops — peas, kale, roots — that shrug off the shoulder-season frosts on either end.

Frequently asked questions

When is the last frost in Wanship Dam, UT?

The average last spring frost in Wanship Dam is around Jun 11, 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 Wanship Dam, UT?

The average first fall frost in Wanship Dam arrives around Sep 12. 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 Wanship Dam?

About 93 frost-free days on average, from Jun 11 to Sep 12. That favors short-season varieties and transplants for warm-season crops, with cool-season vegetables doing the heavy lifting in spring and fall.

What USDA zone is Wanship Dam 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.