Frost Dates for San Luis, AZ 85336

San Luis has 2 ZIP codes. The San Luis, AZ frost page lists all of them with their dates.

Last spring frost January 24 · First fall frost December 20 · 330 frost-free days · USDA Zone 10a

Frost probability for 85336

Frost10%50%90%
Spring (last frost)February 16January 24—
Fall (first frost)November 27December 20—

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (17.0 km away); the 50% date is the median year.

Month by month in San Luis

MonthWhat to do
JanuaryLast frost around January 24. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
FebruaryFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
MarchSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AprilHarvest regularly to encourage production. Monitor for pests and disease.
MayMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
JuneDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
JulyDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
AugustDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
SeptemberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
OctoberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
NovemberFirst fall frost approaching (around December 20). Transplant fall brassicas. Sow spinach, arugula, and radishes.
DecemberFirst frost around December 20. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.

What grows in a 330-day season

Frequently Asked Questions

What is the last frost date for San Luis, AZ (ZIP 85336)?

The median last spring frost date for San Luis, AZ (ZIP code 85336) is around January 24. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in San Luis, AZ?

The median first fall frost date for San Luis, AZ is around December 20. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in San Luis, AZ?

The frost-free growing season in San Luis is about 330 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is San Luis, AZ?

Based on frost date patterns, San Luis falls approximately in 10a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in San Luis, AZ?

Start tomato seeds indoors 6–8 weeks before your last frost date (around January 24). For San Luis, that's roughly November 29 to December 13. Transplant outdoors 1–2 weeks after your last frost.

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