Glendo 6NE, WY Frost Dates & Growing Season

The two dates every Glendo 6NE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
May 25
~50% chance of frost after
First fall frost
Sep 15
~50% chance of frost before
Growing season
113 days
frost-free stretch
USDA zone
≈ 5a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 13 May 25 Jun 11
First fall frost Sep 27 Sep 15 Sep 4
Hard freeze (28°F), median last May 13 · first Sep 24

Computed from NOAA 1991–2020 climate normals at the GLENDO 6NE 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 Glendo 6NE

Computed from Glendo 6NE's own frost dates. Click any crop for the full zone-5 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Mar 30 – Apr 13 Jun 1 – Jun 8
🫑 Peppers Mar 16 – Mar 30 Jun 8 – Jun 15
🥬 Lettuce Apr 13 – Apr 27 Apr 27 – May 11 Apr 27 – May 25
🫛 Peas Apr 13 – Apr 27
🥕 Carrots May 4 – May 25
🥦 Broccoli Apr 6 – Apr 20 May 4 – May 18
🥬 Kale Apr 13 – Apr 27 Apr 27 – May 11 Apr 27 – May 11
🥒 Cucumbers Apr 27 – May 4 Jun 1 – Jun 8 Jun 1 – Jun 8
🥒 Zucchini Apr 27 – May 4 Jun 1 – Jun 8 Jun 1 – Jun 8
🫘 Green Beans (Bush) Jun 1 – Jun 8
🌽 Sweet Corn Jun 1 – Jun 8
🌿 Basil Apr 13 – Apr 27 Jun 1 – Jun 8 Jun 8 – Jun 15
🧄 Garlic Fall: Aug 4 – Sep 1

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 Glendo 6NE's dates automatically after a lookup.

Reading the season in Glendo 6NE

At about 113 frost-free days, Glendo 6NE 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 Glendo 6NE, WY?

The average last spring frost in Glendo 6NE is around May 25, 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 Glendo 6NE, WY?

The average first fall frost in Glendo 6NE arrives around Sep 15. 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 Glendo 6NE?

About 113 frost-free days on average, from May 25 to Sep 15. 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 Glendo 6NE in?

USDA zone 5a 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.