Globe #3, AZ Frost Dates & Growing Season

The two dates every Globe #3 garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 11
~50% chance of frost after
First fall frost
Nov 21
~50% chance of frost before
Growing season
255 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 19 Mar 11 Mar 29
First fall frost Dec 6 Nov 21 Nov 6
Hard freeze (28°F), median last Feb 21 · first Dec 3

Computed from NOAA 1991–2020 climate normals at the GLOBE #3 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 Globe #3

Computed from Globe #3's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 14 – Jan 28 Mar 18 – Mar 25
🫑 Peppers Dec 31 – Jan 14 Mar 25 – Apr 1
🥬 Lettuce Jan 28 – Feb 11 Feb 11 – Feb 25 Feb 11 – Mar 11
🫛 Peas Jan 28 – Feb 11
🥕 Carrots Feb 18 – Mar 11
🥦 Broccoli Jan 21 – Feb 4 Feb 18 – Mar 4
🥬 Kale Jan 28 – Feb 11 Feb 11 – Feb 25 Feb 11 – Feb 25
🥒 Cucumbers Feb 11 – Feb 18 Mar 18 – Mar 25 Mar 18 – Mar 25
🥒 Zucchini Feb 11 – Feb 18 Mar 18 – Mar 25 Mar 18 – Mar 25
🫘 Green Beans (Bush) Mar 18 – Mar 25
🌽 Sweet Corn Mar 18 – Mar 25
🌿 Basil Jan 28 – Feb 11 Mar 18 – Mar 25 Mar 25 – Apr 1
🧄 Garlic Fall: Oct 10 – Nov 7

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 Globe #3's dates automatically after a lookup.

Reading the season in Globe #3

With roughly 255 frost-free days, Globe #3 gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 21 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Globe #3, AZ?

The average last spring frost in Globe #3 is around Mar 11, 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 Globe #3, AZ?

The average first fall frost in Globe #3 arrives around Nov 21. 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 Globe #3?

About 255 frost-free days on average, from Mar 11 to Nov 21. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Globe #3 in?

USDA zone 9b 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.