Waverly 1W, CO Frost Dates & Growing Season

The two dates every Waverly 1W garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Jun 6
~50% chance of frost after
First fall frost
Sep 15
~50% chance of frost before
Growing season
101 days
frost-free stretch
USDA zone
≈ 5b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 24 Jun 6 Jun 22
First fall frost Sep 26 Sep 15 Sep 3
Hard freeze (28°F), median last May 24 · first Sep 25

Computed from NOAA 1991–2020 climate normals at the WAVERLY 1W 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 Waverly 1W

Computed from Waverly 1W'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 Apr 11 – Apr 25 Jun 13 – Jun 20
🫑 Peppers Mar 28 – Apr 11 Jun 20 – Jun 27
🥬 Lettuce Apr 25 – May 9 May 9 – May 23 May 9 – Jun 6
🫛 Peas Apr 25 – May 9
🥕 Carrots May 16 – Jun 6
🥦 Broccoli Apr 18 – May 2 May 16 – May 30
🥬 Kale Apr 25 – May 9 May 9 – May 23 May 9 – May 23
🥒 Cucumbers May 9 – May 16 Jun 13 – Jun 20 Jun 13 – Jun 20
🥒 Zucchini May 9 – May 16 Jun 13 – Jun 20 Jun 13 – Jun 20
🫘 Green Beans (Bush) Jun 13 – Jun 20
🌽 Sweet Corn Jun 13 – Jun 20
🌿 Basil Apr 25 – May 9 Jun 13 – Jun 20 Jun 20 – Jun 27
🧄 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 Waverly 1W's dates automatically after a lookup.

Reading the season in Waverly 1W

At about 101 frost-free days, Waverly 1W 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 Waverly 1W, CO?

The average last spring frost in Waverly 1W is around Jun 6, 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 Waverly 1W, CO?

The average first fall frost in Waverly 1W 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 Waverly 1W?

About 101 frost-free days on average, from Jun 6 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 Waverly 1W in?

USDA zone 5b 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.