Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85341 (Pima County, 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, Organ Pipe Cactus Nm, AZ (5 miles away).
- Average last spring frostFeb 450% chance of a 32°F freeze after this date
- Average first fall frostDec 1550% chance of a 32°F freeze by this date
- Growing season (frost-free)314 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°F avg. coldest night
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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
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
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 85341 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring late January to February; fall September to October.
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 Mar 22 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
- Lettuce: fall sowing Oct 6–Nov 3
- Kale: fall transplant Sep 22–Oct 20
- Collards: fall transplant Sep 22–Oct 20
- Kohlrabi: fall sowing Oct 6–20
- Swiss chard: fall sowing Oct 6–20
- Beet: fall sowing Oct 6–20
- Turnip: fall sowing Oct 6–20
- Green onion / scallion: fall sowing Oct 6–20
- Strawberry (plants): fall transplant Oct 6–Nov 3
Coming up in the next 3 weeks
- Lettuce: fall transplant Oct 20–Nov 10
- Spinach: fall sowing Oct 20–Nov 10
- Bok choy / Asian greens: fall sowing Oct 20–Nov 3
- Arugula: fall sowing Oct 20–Nov 17
- Mustard greens: fall sowing Oct 20–Nov 3
- Radish: fall sowing Nov 3–17
- Garlic: fall sowing Nov 3–Dec 1
- Shallot: fall sowing Nov 3–Dec 1
- Cilantro: fall sowing Oct 20–Nov 3
- Dill: fall sowing Oct 20–Nov 3
Prune now
No frost-timed pruning windows are open this week.
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) | Dec 31 (prior Dec) |
| 50% (the "average" last frost) | Feb 4 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 3 |
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) | Nov 26 |
| 50% (the "average" first frost) | Dec 15 |
| 90% (late: most years have frozen by now) | Jan 9 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Feb 28 | Dec 1 |
| 32°F (freeze) | Feb 4 | Dec 15 |
| 28°F (hard freeze) | Jan 18 | Jan 5 (next year) |
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 85341
Dates count from your average last spring frost (Feb 4) and first fall frost (Dec 15). 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 | Dec 10–24 | Feb 11–25 (transplant) | Aug 18–Sep 15 (transplant) |
| Pepper (sweet and hot) | Nov 26–Dec 10 | Feb 18–Mar 4 (transplant) | Aug 25–Sep 15 (transplant) |
| Eggplant | Nov 26–Dec 10 | Feb 18–Mar 4 (transplant) | Aug 25–Sep 15 (transplant) |
| Tomatillo | Dec 10–24 | Feb 11–25 (transplant) | – |
| Lettuce | Dec 10–24 | Jan 14–Feb 4 (transplant) Jan 7–Feb 18 (sow outdoors) | Oct 20–Nov 10 (transplant) Oct 6–Nov 3 (sowing) |
| Spinach | – | Dec 24–Jan 14 (sow outdoors) | Oct 20–Nov 10 (sowing) |
| Kale | Dec 10–24 | Jan 7–21 (transplant) Jan 7–21 (sow outdoors) | Sep 22–Oct 20 (transplant) Sep 8–Oct 6 (sowing) |
| Collards | Dec 10–24 | Jan 7–Feb 4 (transplant) Jan 7–Feb 4 (sow outdoors) | Sep 22–Oct 20 (transplant) Sep 8–Oct 6 (sowing) |
| Broccoli | Nov 26–Dec 10 | Jan 7–21 (transplant) | Sep 8–Oct 6 (transplant) |
| Cabbage | Nov 26–Dec 10 | Jan 7–21 (transplant) | Sep 8–Oct 6 (transplant) |
| Cauliflower | Nov 26–Dec 10 | Jan 21–Feb 4 (transplant) | Sep 8–Oct 6 (transplant) |
| Brussels sprouts | Nov 12–26 | Jan 7–21 (transplant) | Aug 25–Sep 15 (transplant) |
| Kohlrabi | Dec 10–24 | Jan 7–21 (transplant) Jan 7–21 (sow outdoors) | Oct 6–20 (sowing) |
| Bok choy / Asian greens | – | Jan 7–21 (sow outdoors) | Oct 20–Nov 3 (sowing) |
| Arugula | – | Jan 7–Feb 4 (sow outdoors) | Oct 20–Nov 17 (sowing) |
| Mustard greens | – | Jan 7–28 (sow outdoors) | Oct 20–Nov 3 (sowing) |
| Swiss chard | Dec 24–Jan 7 | Jan 21–Feb 11 (transplant) Jan 21–Feb 18 (sow outdoors) | Oct 6–20 (sowing) |
| Beet | – | Jan 7–Feb 4 (sow outdoors) | Oct 6–20 (sowing) |
| Carrot | – | Jan 14–Feb 11 (sow outdoors) | Sep 22–Oct 6 (sowing) |
| Radish | – | Dec 31–Feb 11 (sow outdoors) | Nov 3–17 (sowing) |
| Turnip | – | Jan 7–28 (sow outdoors) | Oct 6–20 (sowing) |
| Parsnip | – | Jan 14–Feb 4 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 10–Jan 7 (sow outdoors) | Sep 22–Oct 6 (sowing) |
| Onion (bulbing) | Nov 12–26 | Dec 24–Jan 7 (transplant) | – |
| Green onion / scallion | – | Dec 24–Jan 21 (sow outdoors) | Oct 6–20 (sowing) |
| Leek | Nov 12–26 | Jan 7–21 (transplant) | – |
| Garlic | – | – | Nov 3–Dec 1 (sowing) |
| Shallot | – | Dec 24–Jan 7 (transplant) | Nov 3–Dec 1 (sowing) |
| Potato | – | Jan 7–21 (transplant) | Aug 25–Sep 8 (transplant) |
| Sweet potato | – | Feb 25–Mar 11 (transplant) | – |
| Sweet corn | – | Feb 11–25 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 11–25 (sow outdoors) | Sep 22–Oct 6 (sowing) |
| Bean, pole | – | Feb 11–25 (sow outdoors) | – |
| Lima bean | – | Feb 18–Mar 4 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 25–Mar 18 (sow outdoors) | – |
| Cucumber | Jan 7–14 | Feb 11–25 (transplant) Feb 11–25 (sow outdoors) | Sep 22–Oct 6 (sowing) |
| Summer squash / zucchini | Jan 7–14 | Feb 11–25 (transplant) Feb 11–25 (sow outdoors) | Sep 22–Oct 6 (sowing) |
| Winter squash | Jan 7–14 | Feb 11–25 (transplant) Feb 11–25 (sow outdoors) | – |
| Pumpkin | – | Feb 11–25 (sow outdoors) | – |
| Watermelon | Jan 7–14 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | – |
| Cantaloupe / muskmelon | Jan 7–14 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | – |
| Okra | Dec 24–Jan 7 | Feb 18–Mar 4 (transplant) Feb 18–Mar 4 (sow outdoors) | – |
| Celery | Nov 12–26 | Feb 11–18 (transplant) | – |
| Basil | Dec 24–Jan 7 | Feb 11–25 (transplant) Feb 11–25 (sow outdoors) | – |
| Cilantro | – | Jan 21–Feb 18 (sow outdoors) | Oct 20–Nov 3 (sowing) |
| Parsley | Nov 26–Dec 10 | Jan 21–Feb 4 (transplant) Jan 14–Feb 4 (sow outdoors) | – |
| Dill | – | Feb 4–18 (sow outdoors) | Oct 20–Nov 3 (sowing) |
| Sunflower | – | Feb 4–18 (sow outdoors) | – |
| Asparagus (crowns) | – | Jan 7–21 (transplant) | – |
| Rhubarb (crowns) | – | Jan 7–21 (transplant) | – |
| Strawberry (plants) | – | Jan 7–21 (transplant) | Oct 6–Nov 3 (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: Organ Pipe Cactus Nm, AZ (NOAA GHCN-Daily ID USC00026132), elevation 1,678 ft, 4.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Ajo, AZ | 29 mi | Jan 10 | Dec 21 |
The average last-frost dates of these stations span 25 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85341
When is the last frost in 85341?
The average (50% chance) last spring freeze of 32°F for ZIP 85341 is February 4. For a more cautious planting date, use March 3, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85341?
The average first fall freeze is December 15. In 1 year in 10 it comes by November 26.
What hardiness zone is 85341?
ZIP 85341 is in USDA zone 9b (25 to 30°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 85341 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
85321 Ajo 85634 Sells 85639 Topawa 85337 Gila Bend 85139 Goodyear 85633 85333 Dateland 85193 Casa Grande
Other ZIP codes in Pima County
85321 85601 85614 85619 85622 85629 85633 85634 85639 85641 85645 85653 85654 85701 85704 85705 85706 85707 85708 85709 85710 85711 85712 85713 All Pima County frost dates · Arizona frost dates
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- Freeze alerts
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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.