Frost Dates for Douglas, AZ 85607

Last spring frost April 29 · First fall frost November 2 · 187 frost-free days · USDA Zone 8a

Frost probability for 85607

Frost10%50%90%
Spring (last frost)May 19April 29April 8
Fall (first frost)October 19November 2November 14

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (57.4 km away); the 50% date is the median year.

Frost dates by ZIP code in Douglas, AZ

ZIPLast spring frost (50%)First fall frost (50%)Zone
85607April 29November 28a
85608April 11November 48a

Month by month in Douglas

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around April 29). Start tomatoes about two weeks later, 6–8 weeks before last frost.
MarchStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
AprilLast frost around April 29. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MayFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JuneSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JulyHarvest regularly to encourage production. Monitor for pests and disease.
AugustMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
SeptemberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
OctoberFirst fall frost approaching (around November 2). Transplant fall brassicas. Sow spinach, arugula, and radishes.
NovemberFirst frost around November 2. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
DecemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.

What grows in a 187-day season

Frequently Asked Questions

What is the last frost date for Douglas, AZ (ZIP 85607)?

The median last spring frost date for Douglas, AZ (ZIP code 85607) is around April 29. 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 Douglas, AZ?

The median first fall frost date for Douglas, AZ is around November 2. 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 Douglas, AZ?

The frost-free growing season in Douglas is about 187 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 Douglas, AZ?

Based on frost date patterns, Douglas falls approximately in 8a. 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 Douglas, AZ?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 29). For Douglas, that's roughly March 4 to March 18. Transplant outdoors 1–2 weeks after your last frost.

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