Casa Grande Nm, AZ Frost Dates & Growing Season

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

Last spring frost
Feb 17
~50% chance of frost after
First fall frost
Nov 29
~50% chance of frost before
Growing season
285 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Jan 22 Feb 17 Mar 8
First fall frost Dec 15 Nov 29 Nov 12
Hard freeze (28°F), median last Jan 26 · first Dec 12

Computed from NOAA 1991–2020 climate normals at the CASA GRANDE NM 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 Casa Grande Nm

Computed from Casa Grande Nm'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 Dec 23 – Jan 6 Feb 24 – Mar 3
🫑 Peppers Dec 9 – Dec 23 Mar 3 – Mar 10
🥬 Lettuce Jan 6 – Jan 20 Jan 20 – Feb 3 Jan 20 – Feb 17
🫛 Peas Jan 6 – Jan 20
🥕 Carrots Jan 27 – Feb 17
🥦 Broccoli Dec 30 – Jan 13 Jan 27 – Feb 10
🥬 Kale Jan 6 – Jan 20 Jan 20 – Feb 3 Jan 20 – Feb 3
🥒 Cucumbers Jan 20 – Jan 27 Feb 24 – Mar 3 Feb 24 – Mar 3
🥒 Zucchini Jan 20 – Jan 27 Feb 24 – Mar 3 Feb 24 – Mar 3
🫘 Green Beans (Bush) Feb 24 – Mar 3
🌽 Sweet Corn Feb 24 – Mar 3
🌿 Basil Jan 6 – Jan 20 Feb 24 – Mar 3 Mar 3 – Mar 10
🧄 Garlic Fall: Oct 18 – Nov 15

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 Casa Grande Nm's dates automatically after a lookup.

Reading the season in Casa Grande Nm

With roughly 285 frost-free days, Casa Grande Nm 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 29 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Casa Grande Nm, AZ?

The average last spring frost in Casa Grande Nm is around Feb 17, 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 Casa Grande Nm, AZ?

The average first fall frost in Casa Grande Nm arrives around Nov 29. 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 Casa Grande Nm?

About 285 frost-free days on average, from Feb 17 to Nov 29. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Casa Grande Nm 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.