Frost Dates for Douglas, AZ 85607
Last spring frost April 29 · First fall frost November 2 · 187 frost-free days · USDA Zone 8a
ZIP 85607 has about 17,200 people, the largest of 2 ZIP codes in Douglas.
Long season: 187 frost-free days. Spring frost risk spans April 8–May 19 (41 days). Fall frost risk spans October 19–November 14 (26 days).
Frost probability for 85607
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 19 | April 29 | April 8 |
| Fall (first frost) | October 19 | November 2 | November 14 |
Dates come from NOAA 1971–2000 freeze probabilities at CHIRICAHUA NM (57.4 km away); the 50% date is the median year.
Frost dates by ZIP code in Douglas, AZ
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 85607 | April 29 | November 2 | 8a |
| 85608 | April 11 | November 4 | 8a |
Which crops fit a 187-day season in Douglas
In Douglas (187 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Mar 25 | May 13–May 20 | 145 | fits: 80 days to maturity, 145 available after May 13. | Jul 3 |
| Pepper | Mar 18 | May 13–May 20 | 145 | fits: 75 days to maturity, 145 available after May 13. | Jul 8 |
| Lettuce | Mar 4 | Apr 1–Apr 8 | 222 | two-plantings: Plant Apr 1 and again by Sep 11; both mature before Nov 9. | Sep 11 |
| Carrots | — | Apr 8–Apr 15 | 229 | fits: 70 days to maturity, 229 available after Apr 8. | Aug 31 |
| Cucumber | Apr 8 | May 13–May 20 | 159 | two-plantings: Plant May 13 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Beans | — | May 6–May 20 | 173 | two-plantings: Plant May 6 and again by Aug 13; both mature before Oct 26. | Aug 13 |
| Peas | — | Mar 4–May 13 | 250 | fits: 65 days to maturity, 250 available after Mar 4. | Aug 22 |
| Zucchini | Apr 15 | May 13–May 20 | 159 | two-plantings: Plant May 13 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Onion | Feb 4 | Apr 1–Apr 15 | 222 | fits: 100 days to maturity, 222 available after Apr 1. | — |
| Spinach | — | Mar 4–Apr 22 | 264 | two-plantings: Plant Mar 4 and again by Sep 30; both mature before Nov 23. | Sep 30 |
| Kale | Feb 18 | Apr 1–Apr 15 | 236 | two-plantings: Plant Apr 1 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Broccoli | Mar 4 | Apr 1–Apr 15 | 222 | fits: 80 days to maturity, 222 available after Apr 1. | Aug 7 |
| Cabbage | Mar 4 | Apr 1–Apr 15 | 236 | fits: 70 days to maturity, 236 available after Apr 1. | Aug 31 |
| Radish | — | Mar 4–May 27 | 250 | two-plantings: Plant Mar 4 and again by Oct 1; both mature before Nov 9. | Oct 1 |
| Beets | — | Mar 4–May 27 | 250 | two-plantings: Plant Mar 4 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Potatoes | — | Apr 15–Apr 22 | 208 | fits: 90 days to maturity, 208 available after Apr 15. | — |
| Garlic | — | Nov 2 | 292 | overwinter: Plant Nov 2 to Nov 23; harvest the following summer. | Nov 23 |
| Strawberry | — | Mar 25–May 20 | 243 | perennial: A perennial: plant Mar 25; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 1 | May 6–May 13 | 159 | fits: 75 days to maturity, 159 available after May 6. | Jul 15 |
| Pumpkin | Apr 15 | May 13–May 13 | 152 | fits: 100 days to maturity, 152 available after May 13. | Jun 20 |
| Cauliflower | Mar 18 | Apr 22–May 6 | 201 | fits: 75 days to maturity, 201 available after Apr 22. | Aug 12 |
| Swiss Chard | Mar 4 | Apr 15–Apr 15 | 208 | two-plantings: Plant Apr 15 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Arugula | — | Mar 4–May 27 | 264 | two-plantings: Plant Mar 4 and again by Sep 30; both mature before Nov 23. | Sep 30 |
| Brussel Sprouts | Mar 4 | Apr 1–Apr 15 | 236 | fits: 100 days to maturity, 236 available after Apr 1. | Aug 1 |
| Butternut Squash | Apr 15 | May 13–May 20 | 152 | fits: 100 days to maturity, 152 available after May 13. | Jun 20 |
| Eggplant | Mar 11 | May 13–May 20 | 145 | fits: 70 days to maturity, 145 available after May 13. | Jul 13 |
| Okra | Apr 1 | May 6–May 13 | 166 | two-plantings: Plant May 6 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Basil | Mar 25 | May 20–May 20 | 152 | two-plantings: Plant May 20 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Cilantro | — | Apr 1–Apr 22 | 222 | two-plantings: Plant Apr 1 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Parsley | Feb 18 | May 6–May 13 | 187 | fits: 70 days to maturity, 187 available after May 6. | Aug 17 |
| Celery | Feb 18 | May 6–May 20 | 187 | fits: 120 days to maturity, 187 available after May 6. | Jun 28 |
| Scallions | Feb 18 | Apr 1–Apr 15 | 236 | two-plantings: Plant Apr 1 and again by Sep 10; both mature before Nov 23. | Sep 10 |
| Turnip | — | Apr 1–Apr 15 | 236 | two-plantings: Plant Apr 1 and again by Sep 20; both mature before Nov 23. | Sep 20 |
| Kohlrabi | — | Mar 18–Apr 1 | 250 | two-plantings: Plant Mar 18 and again by Sep 15; both mature before Nov 23. | Sep 15 |
| Bok Choy | Apr 1 | Apr 22–Apr 29 | 201 | two-plantings: Plant Apr 22 and again by Sep 11; both mature before Nov 9. | Sep 11 |
| Collards | Feb 18 | Apr 1–Apr 15 | 236 | two-plantings: Plant Apr 1 and again by Sep 10; both mature before Nov 23. | Sep 10 |
| Cantaloupe | Apr 15 | May 13–May 20 | 145 | fits: 85 days to maturity, 145 available after May 13. | Jun 28 |
| Chives | Feb 4 | May 6–May 13 | 201 | fits: 90 days to maturity, 201 available after May 6. | — |
| Dill | — | Mar 4–May 27 | 250 | two-plantings: Plant Mar 4 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Oregano | Feb 18 | May 6–May 13 | 201 | fits: 80 days to maturity, 201 available after May 6. | — |
| Rosemary | Feb 4 | May 6–May 13 | 187 | fits: 80 days to maturity, 187 available after May 6. | — |
| Sage | Mar 4 | May 6–May 13 | 201 | fits: 75 days to maturity, 201 available after May 6. | — |
| Thyme | Feb 18 | May 6–May 13 | 201 | fits: 90 days to maturity, 201 available after May 6. | — |
| Calendula | Mar 18 | Apr 15–Apr 29 | 208 | two-plantings: Plant Apr 15 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Cosmos | Apr 1 | Apr 29–May 13 | 173 | two-plantings: Plant Apr 29 and again by Aug 6; both mature before Oct 19. | Aug 6 |
| Lavender | Feb 4 | Apr 29–May 13 | 208 | fits: 90 days to maturity, 208 available after Apr 29. | — |
| Marigolds | Mar 18 | Apr 29–May 6 | 173 | two-plantings: Plant Apr 29 and again by Aug 16; both mature before Oct 19. | Aug 16 |
| Melons | Apr 15 | May 13–May 20 | 145 | fits: 85 days to maturity, 145 available after May 13. | Jun 28 |
| Mint | — | Apr 29–May 13 | 208 | fits: 90 days to maturity, 208 available after Apr 29. | — |
| Nasturtiums | Apr 1 | Apr 29–May 6 | 173 | two-plantings: Plant Apr 29 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Pole Beans | — | May 6–May 20 | 166 | fits: 65 days to maturity, 166 available after May 6. | Aug 1 |
| Spaghetti Squash | Apr 15 | May 13–May 20 | 152 | fits: 90 days to maturity, 152 available after May 13. | Jun 30 |
| Sunflowers | — | Apr 29–May 13 | 173 | fits: 70 days to maturity, 173 available after Apr 29. | Jul 27 |
| Tomatillos | Mar 4 | May 6–May 13 | 152 | fits: 75 days to maturity, 152 available after May 6. | Jul 8 |
| Watermelon | Apr 15 | May 6–May 13 | 152 | fits: 80 days to maturity, 152 available after May 6. | Jul 3 |
| Yellow Squash | Apr 15 | May 13–May 20 | 159 | two-plantings: Plant May 13 and again by Aug 11; both mature before Oct 19. | Aug 11 |
| Zinnias | Apr 1 | Apr 29–May 13 | 173 | two-plantings: Plant Apr 29 and again by Aug 6; both mature before Oct 19. | Aug 6 |
Month by month in Douglas
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 4), Lavender (Feb 4), Onion (Feb 4), Rosemary (Feb 4), Celery (Feb 18), Collards (Feb 18), +5 more. |
| March | Start indoors: Broccoli (Mar 4), Brussel Sprouts (Mar 4), Cabbage (Mar 4), Lettuce (Mar 4), Sage (Mar 4), Swiss Chard (Mar 4), +8 more. Direct sow from: Arugula (Mar 4), Beets (Mar 4), Dill (Mar 4), Peas (Mar 4), Radish (Mar 4), Spinach (Mar 4), +1 more. Plant: Strawberry (Mar 25). |
| April | Start indoors: Bok Choy (Apr 1), Corn (Apr 1), Cosmos (Apr 1), Nasturtiums (Apr 1), Okra (Apr 1), Zinnias (Apr 1), +9 more. Direct sow from: Cilantro (Apr 1), Turnip (Apr 1), Carrots (Apr 8), Potatoes (Apr 15), Sunflowers (Apr 29). Transplant from: Broccoli (Apr 1), Brussel Sprouts (Apr 1), Cabbage (Apr 1), Collards (Apr 1), Kale (Apr 1), Lettuce (Apr 1), +12 more. Last frost around April 29. |
| May | Direct sow from: Beans (May 6), Pole Beans (May 6). Transplant from: Celery (May 6), Chives (May 6), Corn (May 6), Okra (May 6), Oregano (May 6), Parsley (May 6), +17 more. |
| June | Last sowing dates: Butternut Squash (Jun 20), Pumpkin (Jun 20), Cantaloupe (Jun 28), Celery (Jun 28), Melons (Jun 28), Spaghetti Squash (Jun 30). |
| July | Last sowing dates: Tomato (Jul 3), Watermelon (Jul 3), Pepper (Jul 8), Tomatillos (Jul 8), Eggplant (Jul 13), Corn (Jul 15), +1 more. |
| August | Last sowing dates: Brussel Sprouts (Aug 1), Pole Beans (Aug 1), Basil (Aug 6), Cosmos (Aug 6), Cucumber (Aug 6), Zinnias (Aug 6), +12 more. |
| September | Last sowing dates: Beets (Sep 1), Dill (Sep 1), Swiss Chard (Sep 1), Calendula (Sep 6), Cilantro (Sep 6), Collards (Sep 10), +8 more. |
| October | Last sowing dates: Radish (Oct 1). |
| November | Direct sow from: Garlic (Nov 2). First frost around November 2. Last sowing dates: Garlic (Nov 23). |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
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. One year in ten frost ends before April 8; one in ten it runs past May 19.
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. The first frost arrives around October 19 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
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. In Douglas (187 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Douglas, AZ?
Douglas, AZ is in USDA hardiness zone 8a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Douglas, AZ?
Start tomatoes indoors Mar 25 and plant out May 13 in Douglas. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Douglas?
Two: plant Apr 1 and again by Sep 11; both mature before Nov 9.
When do I plant garlic in Douglas?
Nov 2 to Nov 23; it overwinters and is ready the following summer.
Can I get two tomato crops in Douglas?
Yes: plant out May 13 for a summer crop, and set out a second round of transplants by Jul 3 for a fall crop.
Which nearby ZIP has a longer season?
Sierra Vista (ZIP 85635) has 202 frost-free days, 15 more than Douglas (ZIP 85607). See Sierra Vista ZIP 85635 frost dates
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