Rock Springs Airport, WY Frost Dates & Growing Season

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

Last spring frost
May 22
~50% chance of frost after
First fall frost
Sep 28
~50% chance of frost before
Growing season
129 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 5 May 22 Jun 9
First fall frost Oct 9 Sep 28 Sep 14
Hard freeze (28°F), median last May 7 · first Oct 5

Computed from NOAA 1991–2020 climate normals at the ROCK SPRINGS 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 Rock Springs Airport

Computed from Rock Springs Airport'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 27 – Apr 10 May 29 – Jun 5
🫑 Peppers Mar 13 – Mar 27 Jun 5 – Jun 12
🥬 Lettuce Apr 10 – Apr 24 Apr 24 – May 8 Apr 24 – May 22
🫛 Peas Apr 10 – Apr 24
🥕 Carrots May 1 – May 22
🥦 Broccoli Apr 3 – Apr 17 May 1 – May 15
🥬 Kale Apr 10 – Apr 24 Apr 24 – May 8 Apr 24 – May 8
🥒 Cucumbers Apr 24 – May 1 May 29 – Jun 5 May 29 – Jun 5
🥒 Zucchini Apr 24 – May 1 May 29 – Jun 5 May 29 – Jun 5
🫘 Green Beans (Bush) May 29 – Jun 5
🌽 Sweet Corn May 29 – Jun 5
🌿 Basil Apr 10 – Apr 24 May 29 – Jun 5 Jun 5 – Jun 12
🧄 Garlic Fall: Aug 17 – Sep 14

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 Rock Springs Airport's dates automatically after a lookup.

Reading the season in Rock Springs Airport

At about 129 frost-free days, Rock Springs Airport 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 Rock Springs Airport, WY?

The average last spring frost in Rock Springs Airport is around May 22, 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 Rock Springs Airport, WY?

The average first fall frost in Rock Springs Airport arrives around Sep 28. 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 Rock Springs Airport?

About 129 frost-free days on average, from May 22 to Sep 28. 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 Rock Springs Airport 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.