Seligman, AZ Frost Dates & Growing Season

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

Last spring frost
May 10
~50% chance of frost after
First fall frost
Oct 15
~50% chance of frost before
Growing season
158 days
frost-free stretch
USDA zone
≈ 6a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 26 May 10 May 29
First fall frost Oct 30 Oct 15 Oct 1
Hard freeze (28°F), median last Apr 24 · first Oct 26

Computed from NOAA 1991–2020 climate normals at the SELIGMAN 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 Seligman

Computed from Seligman'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 15 – Mar 29 May 17 – May 24
🫑 Peppers Mar 1 – Mar 15 May 24 – May 31
🥬 Lettuce Mar 29 – Apr 12 Apr 12 – Apr 26 Apr 12 – May 10
🫛 Peas Mar 29 – Apr 12
🥕 Carrots Apr 19 – May 10
🥦 Broccoli Mar 22 – Apr 5 Apr 19 – May 3
🥬 Kale Mar 29 – Apr 12 Apr 12 – Apr 26 Apr 12 – Apr 26
🥒 Cucumbers Apr 12 – Apr 19 May 17 – May 24 May 17 – May 24
🥒 Zucchini Apr 12 – Apr 19 May 17 – May 24 May 17 – May 24
🫘 Green Beans (Bush) May 17 – May 24
🌽 Sweet Corn May 17 – May 24
🌿 Basil Mar 29 – Apr 12 May 17 – May 24 May 24 – May 31
🧄 Garlic Fall: Sep 3 – Oct 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 Seligman's dates automatically after a lookup.

Reading the season in Seligman

Roughly 158 frost-free days gives Seligman gardeners room for nearly every common vegetable. Warm-season crops go out after May 10; a fall garden sown in late summer matures comfortably before the Oct 15 frost.

Frequently asked questions

When is the last frost in Seligman, AZ?

The average last spring frost in Seligman is around May 10, 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 Seligman, AZ?

The average first fall frost in Seligman arrives around Oct 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 Seligman?

About 158 frost-free days on average, from May 10 to Oct 15. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Seligman 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.