Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85603 (Bisbee, AZ)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Bisbee 1WNW, AZ (1 miles away).
- Average last spring frostApr 150% chance of a 32°F freeze after this date
- Average first fall frostNov 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)222 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°F avg. coldest night
Get The Dial for 85603 (Bisbee)
Frost and freeze alerts from the NWS forecast for 85603, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.
This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
66°F 55°F or warmer
24-hour average · latest 64°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Walnut Gulch #1 (23 mi), Elgin 5 S (36 mi).
4-inch depth
68°F 55°F or warmer
24-hour average · latest 68°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Walnut Gulch #1 (23 mi), Elgin 5 S (36 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 85603 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 68°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
Fertilizer window
Lawn region: Arid Southwest (low desert). Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about May 17 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Perennial ryegrass (cool-season): Early fall: September; Late fall: October–November; Overseeded Bermuda: Light feeding once the winter rye is established, if needed. Avoid: Summer feeding.
Plant now
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 10: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Mar 13 |
| 50% (the "average" last frost) | Apr 1 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 20 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Oct 25 |
| 50% (the "average" first frost) | Nov 10 |
| 90% (late: most years have frozen by now) | Nov 28 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 18 | Oct 30 |
| 32°F (freeze) | Apr 1 | Nov 10 |
| 28°F (hard freeze) | Mar 13 | Nov 24 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 85603
Dates count from your average last spring frost (Apr 1) and first fall frost (Nov 10). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Feb 4–18 | Apr 8–22 (transplant) | Jul 14–Aug 11 (transplant) |
| Pepper (sweet and hot) | Jan 21–Feb 4 | Apr 15–29 (transplant) | Jul 21–Aug 11 (transplant) |
| Eggplant | Jan 21–Feb 4 | Apr 15–29 (transplant) | Jul 21–Aug 11 (transplant) |
| Tomatillo | Feb 4–18 | Apr 8–22 (transplant) | – |
| Lettuce | Feb 4–18 | Mar 11–Apr 1 (transplant) Mar 4–Apr 15 (sow outdoors) | Sep 15–Oct 6 (transplant) Sep 1–29 (sowing) |
| Spinach | – | Feb 18–Mar 11 (sow outdoors) | Sep 15–Oct 6 (sowing) |
| Kale | Feb 4–18 | Mar 4–18 (transplant) Mar 4–18 (sow outdoors) | Aug 18–Sep 15 (transplant) Aug 4–Sep 1 (sowing) |
| Collards | Feb 4–18 | Mar 4–Apr 1 (transplant) Mar 4–Apr 1 (sow outdoors) | Aug 18–Sep 15 (transplant) Aug 4–Sep 1 (sowing) |
| Broccoli | Jan 21–Feb 4 | Mar 4–18 (transplant) | Aug 4–Sep 1 (transplant) |
| Cabbage | Jan 21–Feb 4 | Mar 4–18 (transplant) | Aug 4–Sep 1 (transplant) |
| Cauliflower | Jan 21–Feb 4 | Mar 18–Apr 1 (transplant) | Aug 4–Sep 1 (transplant) |
| Brussels sprouts | Jan 7–21 | Mar 4–18 (transplant) | Jul 21–Aug 11 (transplant) |
| Kohlrabi | Feb 4–18 | Mar 4–18 (transplant) Mar 4–18 (sow outdoors) | Sep 1–15 (sowing) |
| Bok choy / Asian greens | – | Mar 4–18 (sow outdoors) | Sep 15–29 (sowing) |
| Arugula | – | Mar 4–Apr 1 (sow outdoors) | Sep 15–Oct 13 (sowing) |
| Mustard greens | – | Mar 4–25 (sow outdoors) | Sep 15–29 (sowing) |
| Swiss chard | Feb 18–Mar 4 | Mar 18–Apr 8 (transplant) Mar 18–Apr 15 (sow outdoors) | Sep 1–15 (sowing) |
| Beet | – | Mar 4–Apr 1 (sow outdoors) | Sep 1–15 (sowing) |
| Carrot | – | Mar 11–Apr 8 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Radish | – | Feb 25–Apr 8 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Turnip | – | Mar 4–25 (sow outdoors) | Sep 1–15 (sowing) |
| Parsnip | – | Mar 11–Apr 1 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 4–Mar 4 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Onion (bulbing) | Jan 7–21 | Feb 18–Mar 4 (transplant) | – |
| Green onion / scallion | – | Feb 18–Mar 18 (sow outdoors) | Sep 1–15 (sowing) |
| Leek | Jan 7–21 | Mar 4–18 (transplant) | – |
| Garlic | – | – | Sep 29–Oct 27 (sowing) |
| Shallot | – | Feb 18–Mar 4 (transplant) | Sep 29–Oct 27 (sowing) |
| Potato | – | Mar 4–18 (transplant) | Jul 21–Aug 4 (transplant) |
| Sweet potato | – | Apr 22–May 6 (transplant) | – |
| Sweet corn | – | Apr 8–22 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 8–22 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Bean, pole | – | Apr 8–22 (sow outdoors) | – |
| Lima bean | – | Apr 15–29 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 22–May 13 (sow outdoors) | – |
| Cucumber | Mar 4–11 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Summer squash / zucchini | Mar 4–11 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Winter squash | Mar 4–11 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | – |
| Pumpkin | – | Apr 8–22 (sow outdoors) | – |
| Watermelon | Mar 4–11 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 4–11 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Okra | Feb 18–Mar 4 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Celery | Jan 7–21 | Apr 8–15 (transplant) | – |
| Basil | Feb 18–Mar 4 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | – |
| Cilantro | – | Mar 18–Apr 15 (sow outdoors) | Sep 15–29 (sowing) |
| Parsley | Jan 21–Feb 4 | Mar 18–Apr 1 (transplant) Mar 11–Apr 1 (sow outdoors) | – |
| Dill | – | Apr 1–15 (sow outdoors) | Sep 15–29 (sowing) |
| Sunflower | – | Apr 1–15 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 4–18 (transplant) | – |
| Rhubarb (crowns) | – | Mar 4–18 (transplant) | – |
| Strawberry (plants) | – | Mar 4–18 (transplant) | Sep 1–29 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Bisbee 1WNW, AZ (NOAA GHCN-Daily ID USC00020775), elevation 5,560 ft, 1.2 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Douglas Bisbee Inl AP, AZ | 19 mi | Apr 11 | Nov 2 |
| Mc Neal, AZ | 19 mi | Apr 6 | Nov 10 |
| Coronado Nmem, AZ | 21 mi | Apr 7 | Nov 9 |
The average last-frost dates of these stations span 10 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85603
When is the last frost in 85603?
The average (50% chance) last spring freeze of 32°F for ZIP 85603 is April 1. For a more cautious planting date, use April 20, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85603?
The average first fall freeze is November 10. In 1 year in 10 it comes by October 25.
What hardiness zone is 85603?
ZIP 85603 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 85603 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
85620 Naco 85617 McNeal 85635 Sierra Vista 85650 Sierra Vista Southeast 85615 Sierra Vista Southeast 85638 Tombstone 85608 Douglas 85626 Pirtleville
Other ZIP codes in Cochise County
85602 85605 85606 85607 85608 85609 85610 85613 85615 85616 85617 85620 85625 85626 85627 85630 85632 85635 85638 85650 All Cochise County frost dates · Arizona frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.