Circleville, UT Frost Dates & Growing Season

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

Last spring frost
May 23
~50% chance of frost after
First fall frost
Sep 27
~50% chance of frost before
Growing season
127 days
frost-free stretch
USDA zone
≈ 6a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 4 May 23 Jun 13
First fall frost Oct 8 Sep 27 Sep 12
Hard freeze (28°F), median last May 8 · first Oct 5

Computed from NOAA 1991–2020 climate normals at the CIRCLEVILLE 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 Circleville

Computed from Circleville's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 28 – Apr 11 May 30 – Jun 6
🫑 Peppers Mar 14 – Mar 28 Jun 6 – Jun 13
🥬 Lettuce Apr 11 – Apr 25 Apr 25 – May 9 Apr 25 – May 23
🫛 Peas Apr 11 – Apr 25
🥕 Carrots May 2 – May 23
🥦 Broccoli Apr 4 – Apr 18 May 2 – May 16
🥬 Kale Apr 11 – Apr 25 Apr 25 – May 9 Apr 25 – May 9
🥒 Cucumbers Apr 25 – May 2 May 30 – Jun 6 May 30 – Jun 6
🥒 Zucchini Apr 25 – May 2 May 30 – Jun 6 May 30 – Jun 6
🫘 Green Beans (Bush) May 30 – Jun 6
🌽 Sweet Corn May 30 – Jun 6
🌿 Basil Apr 11 – Apr 25 May 30 – Jun 6 Jun 6 – Jun 13
🧄 Garlic Fall: Aug 16 – Sep 13

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 Circleville's dates automatically after a lookup.

Reading the season in Circleville

At about 127 frost-free days, Circleville 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 Circleville, UT?

The average last spring frost in Circleville is around May 23, 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 Circleville, UT?

The average first fall frost in Circleville arrives around Sep 27. 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 Circleville?

About 127 frost-free days on average, from May 23 to Sep 27. 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 Circleville in?

USDA zone 6a 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.