Fall in zone 10aPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85310 (Phoenix, 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, Phoenix Deer Valley Muni AP, AZ (4 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 70% of years (about 3 freezing night(s) a year on average). The dates below describe freeze timing for the station's record; in many years there may be no 32°F freeze at all.
- Average last spring frostJan 850% chance of a 32°F freeze after this date
- Average first fall frostDec 2550% chance of a 32°F freeze by this date
- Growing season (frost-free)354 daysmedian, 32°F threshold
- USDA hardiness zone10a30 to 35°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
Freezes are uncommon here, so frost-based timing is rough. Local extension calendars for frost-free areas use months.
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 85310 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 Feb 23 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 16–Nov 13
- Kale: fall transplant Oct 2–30
- Collards: fall transplant Oct 2–30
- Brussels sprouts: start seeds indoors Oct 16–30
- Kohlrabi: fall sowing Oct 16–30
- Swiss chard: fall sowing Oct 16–30
- Beet: fall sowing Oct 16–30
- Turnip: fall sowing Oct 16–30
- Onion (bulbing): start seeds indoors Oct 16–30
- Green onion / scallion: fall sowing Oct 16–30
- Leek: start seeds indoors Oct 16–30
- Celery: start seeds indoors Oct 16–30
- Strawberry (plants): fall transplant Oct 16–Nov 13
Coming up in the next 3 weeks
- Pepper (sweet and hot): start seeds indoors Oct 30–Nov 13
- Eggplant: start seeds indoors Oct 30–Nov 13
- Lettuce: fall transplant Oct 30–Nov 20
- Spinach: fall sowing Oct 30–Nov 20
- Broccoli: start seeds indoors Oct 30–Nov 13
- Cabbage: start seeds indoors Oct 30–Nov 13
- Cauliflower: start seeds indoors Oct 30–Nov 13
- Bok choy / Asian greens: fall sowing Oct 30–Nov 13
- Arugula: fall sowing Oct 30–Nov 27
- Mustard greens: fall sowing Oct 30–Nov 13
- Cilantro: fall sowing Oct 30–Nov 13
- Parsley: start seeds indoors Oct 30–Nov 13
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 16 (prior Dec) |
| 50% (the "average" last frost) | Jan 8 |
| 10% (cautious: only 1 year in 10 freezes later) | Feb 12 |
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) | Dec 5 |
| 50% (the "average" first frost) | Dec 25 |
| 90% (late: most years have frozen by now) | Jan 23 (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 1 | Dec 11 |
| 32°F (freeze) | Jan 8 | Dec 25 |
| 28°F (hard freeze) | Jan 8 | Jan 7 (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 85310
Dates count from your average last spring frost (Jan 8) and first fall frost (Dec 25). 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 | Nov 13–27 | Jan 15–29 (transplant) | Aug 28–Sep 25 (transplant) |
| Pepper (sweet and hot) | Oct 30–Nov 13 | Jan 22–Feb 5 (transplant) | Sep 4–25 (transplant) |
| Eggplant | Oct 30–Nov 13 | Jan 22–Feb 5 (transplant) | Sep 4–25 (transplant) |
| Tomatillo | Nov 13–27 | Jan 15–29 (transplant) | – |
| Lettuce | Nov 13–27 | Dec 18–Jan 8 (transplant) Dec 11–Jan 22 (sow outdoors) | Oct 30–Nov 20 (transplant) Oct 16–Nov 13 (sowing) |
| Spinach | – | Nov 27–Dec 18 (sow outdoors) | Oct 30–Nov 20 (sowing) |
| Kale | Nov 13–27 | Dec 11–25 (transplant) Dec 11–25 (sow outdoors) | Oct 2–30 (transplant) Sep 18–Oct 16 (sowing) |
| Collards | Nov 13–27 | Dec 11–Jan 8 (transplant) Dec 11–Jan 8 (sow outdoors) | Oct 2–30 (transplant) Sep 18–Oct 16 (sowing) |
| Broccoli | Oct 30–Nov 13 | Dec 11–25 (transplant) | Sep 18–Oct 16 (transplant) |
| Cabbage | Oct 30–Nov 13 | Dec 11–25 (transplant) | Sep 18–Oct 16 (transplant) |
| Cauliflower | Oct 30–Nov 13 | Dec 25–Jan 8 (transplant) | Sep 18–Oct 16 (transplant) |
| Brussels sprouts | Oct 16–30 | Dec 11–25 (transplant) | Sep 4–25 (transplant) |
| Kohlrabi | Nov 13–27 | Dec 11–25 (transplant) Dec 11–25 (sow outdoors) | Oct 16–30 (sowing) |
| Bok choy / Asian greens | – | Dec 11–25 (sow outdoors) | Oct 30–Nov 13 (sowing) |
| Arugula | – | Dec 11–Jan 8 (sow outdoors) | Oct 30–Nov 27 (sowing) |
| Mustard greens | – | Dec 11–Jan 1 (sow outdoors) | Oct 30–Nov 13 (sowing) |
| Swiss chard | Nov 27–Dec 11 | Dec 25–Jan 15 (transplant) Dec 25–Jan 22 (sow outdoors) | Oct 16–30 (sowing) |
| Beet | – | Dec 11–Jan 8 (sow outdoors) | Oct 16–30 (sowing) |
| Carrot | – | Dec 18–Jan 15 (sow outdoors) | Oct 2–16 (sowing) |
| Radish | – | Dec 4–Jan 15 (sow outdoors) | Nov 13–27 (sowing) |
| Turnip | – | Dec 11–Jan 1 (sow outdoors) | Oct 16–30 (sowing) |
| Parsnip | – | Dec 18–Jan 8 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Nov 13–Dec 11 (sow outdoors) | Oct 2–16 (sowing) |
| Onion (bulbing) | Oct 16–30 | Nov 27–Dec 11 (transplant) | – |
| Green onion / scallion | – | Nov 27–Dec 25 (sow outdoors) | Oct 16–30 (sowing) |
| Leek | Oct 16–30 | Dec 11–25 (transplant) | – |
| Garlic | – | – | Nov 13–Dec 11 (sowing) |
| Shallot | – | Nov 27–Dec 11 (transplant) | Nov 13–Dec 11 (sowing) |
| Potato | – | Dec 11–25 (transplant) | Sep 4–18 (transplant) |
| Sweet potato | – | Jan 29–Feb 12 (transplant) | – |
| Sweet corn | – | Jan 15–29 (sow outdoors) | – |
| Bean, bush (snap) | – | Jan 15–29 (sow outdoors) | Oct 2–16 (sowing) |
| Bean, pole | – | Jan 15–29 (sow outdoors) | – |
| Lima bean | – | Jan 22–Feb 5 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jan 29–Feb 19 (sow outdoors) | – |
| Cucumber | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | Oct 2–16 (sowing) |
| Summer squash / zucchini | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | Oct 2–16 (sowing) |
| Winter squash | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | – |
| Pumpkin | – | Jan 15–29 (sow outdoors) | – |
| Watermelon | Dec 11–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 11–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Okra | Nov 27–Dec 11 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Celery | Oct 16–30 | Jan 15–22 (transplant) | – |
| Basil | Nov 27–Dec 11 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | – |
| Cilantro | – | Dec 25–Jan 22 (sow outdoors) | Oct 30–Nov 13 (sowing) |
| Parsley | Oct 30–Nov 13 | Dec 25–Jan 8 (transplant) Dec 18–Jan 8 (sow outdoors) | – |
| Dill | – | Jan 8–22 (sow outdoors) | Oct 30–Nov 13 (sowing) |
| Sunflower | – | Jan 8–22 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 11–25 (transplant) | – |
| Rhubarb (crowns) | – | Dec 11–25 (transplant) | – |
| Strawberry (plants) | – | Dec 11–25 (transplant) | Oct 16–Nov 13 (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: Phoenix Deer Valley Muni AP, AZ (NOAA GHCN-Daily ID USW00003184), elevation 1,455 ft, 4.5 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Youngtown, AZ | 11 mi | Jan 20 | Dec 15 |
| Scottsdale Muni AP, AZ | 15 mi | Jan 6 | Dec 26 |
| Carefree, AZ | 17 mi | Feb 4 | Dec 16 |
The average last-frost dates of these stations span 29 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85310
When is the last frost in 85310?
The average (50% chance) last spring freeze of 32°F for ZIP 85310 is January 8. For a more cautious planting date, use February 12, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85310?
The average first fall freeze is December 25. In 1 year in 10 it comes by December 5.
What hardiness zone is 85310?
ZIP 85310 is in USDA zone 10a (30 to 35°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 85310 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
85308 Glendale 85083 Phoenix 85027 Phoenix 85053 Phoenix 85085 Phoenix 85306 Glendale 85023 Phoenix 85382 Peoria
Other ZIP codes in Maricopa County
85003 85004 85006 85007 85008 85009 85012 85013 85014 85015 85016 85017 85018 85019 85020 85021 85022 85023 85024 85026 85027 85028 85029 85031 All Maricopa 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.