Grand Canyon E Entrance, AZ Frost Dates & Growing Season

The two dates every Grand Canyon E Entrance 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 20
~50% chance of frost before
Growing season
163 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 23 May 10 May 24
First fall frost Nov 5 Oct 20 Oct 7
Hard freeze (28°F), median last Apr 26 · first Nov 2

Computed from NOAA 1991–2020 climate normals at the GRAND CANYON E ENTRANCE 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 Grand Canyon E Entrance

Computed from Grand Canyon E Entrance'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 8 – Oct 6

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 Grand Canyon E Entrance's dates automatically after a lookup.

Reading the season in Grand Canyon E Entrance

Roughly 163 frost-free days gives Grand Canyon E Entrance 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 20 frost.

Frequently asked questions

When is the last frost in Grand Canyon E Entrance, AZ?

The average last spring frost in Grand Canyon E Entrance 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 Grand Canyon E Entrance, AZ?

The average first fall frost in Grand Canyon E Entrance arrives around Oct 20. 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 Grand Canyon E Entrance?

About 163 frost-free days on average, from May 10 to Oct 20. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Grand Canyon E Entrance 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.