Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85530 (Bylas, 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, San Carlos Reservoir, AZ (16 miles away).
- Average last spring frostMar 1350% chance of a 32°F freeze after this date
- Average first fall frostNov 1950% chance of a 32°F freeze by this date
- Growing season (frost-free)247 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°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 85530 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 Apr 28 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
- Arugula: fall sowing Sep 24–Oct 22
- Radish: fall sowing Oct 8–22
- Garlic: fall sowing Oct 8–Nov 5
- Shallot: fall sowing Oct 8–Nov 5
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 19: 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) | Feb 17 |
| 50% (the "average" last frost) | Mar 13 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 6 |
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 3 |
| 50% (the "average" first frost) | Nov 19 |
| 90% (late: most years have frozen by now) | Dec 4 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 1 | Nov 9 |
| 32°F (freeze) | Mar 13 | Nov 19 |
| 28°F (hard freeze) | Feb 17 | Dec 1 |
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 85530
Dates count from your average last spring frost (Mar 13) and first fall frost (Nov 19). 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 | Jan 16–30 | Mar 20–Apr 3 (transplant) | Jul 23–Aug 20 (transplant) |
| Pepper (sweet and hot) | Jan 2–16 | Mar 27–Apr 10 (transplant) | Jul 30–Aug 20 (transplant) |
| Eggplant | Jan 2–16 | Mar 27–Apr 10 (transplant) | Jul 30–Aug 20 (transplant) |
| Tomatillo | Jan 16–30 | Mar 20–Apr 3 (transplant) | – |
| Lettuce | Jan 16–30 | Feb 20–Mar 13 (transplant) Feb 13–Mar 27 (sow outdoors) | Sep 24–Oct 15 (transplant) Sep 10–Oct 8 (sowing) |
| Spinach | – | Jan 30–Feb 20 (sow outdoors) | Sep 24–Oct 15 (sowing) |
| Kale | Jan 16–30 | Feb 13–27 (transplant) Feb 13–27 (sow outdoors) | Aug 27–Sep 24 (transplant) Aug 13–Sep 10 (sowing) |
| Collards | Jan 16–30 | Feb 13–Mar 13 (transplant) Feb 13–Mar 13 (sow outdoors) | Aug 27–Sep 24 (transplant) Aug 13–Sep 10 (sowing) |
| Broccoli | Jan 2–16 | Feb 13–27 (transplant) | Aug 13–Sep 10 (transplant) |
| Cabbage | Jan 2–16 | Feb 13–27 (transplant) | Aug 13–Sep 10 (transplant) |
| Cauliflower | Jan 2–16 | Feb 27–Mar 13 (transplant) | Aug 13–Sep 10 (transplant) |
| Brussels sprouts | Dec 19–Jan 2 | Feb 13–27 (transplant) | Jul 30–Aug 20 (transplant) |
| Kohlrabi | Jan 16–30 | Feb 13–27 (transplant) Feb 13–27 (sow outdoors) | Sep 10–24 (sowing) |
| Bok choy / Asian greens | – | Feb 13–27 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Arugula | – | Feb 13–Mar 13 (sow outdoors) | Sep 24–Oct 22 (sowing) |
| Mustard greens | – | Feb 13–Mar 6 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Swiss chard | Jan 30–Feb 13 | Feb 27–Mar 20 (transplant) Feb 27–Mar 27 (sow outdoors) | Sep 10–24 (sowing) |
| Beet | – | Feb 13–Mar 13 (sow outdoors) | Sep 10–24 (sowing) |
| Carrot | – | Feb 20–Mar 20 (sow outdoors) | Aug 27–Sep 10 (sowing) |
| Radish | – | Feb 6–Mar 20 (sow outdoors) | Oct 8–22 (sowing) |
| Turnip | – | Feb 13–Mar 6 (sow outdoors) | Sep 10–24 (sowing) |
| Parsnip | – | Feb 20–Mar 13 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Jan 16–Feb 13 (sow outdoors) | Aug 27–Sep 10 (sowing) |
| Onion (bulbing) | Dec 19–Jan 2 | Jan 30–Feb 13 (transplant) | – |
| Green onion / scallion | – | Jan 30–Feb 27 (sow outdoors) | Sep 10–24 (sowing) |
| Leek | Dec 19–Jan 2 | Feb 13–27 (transplant) | – |
| Garlic | – | – | Oct 8–Nov 5 (sowing) |
| Shallot | – | Jan 30–Feb 13 (transplant) | Oct 8–Nov 5 (sowing) |
| Potato | – | Feb 13–27 (transplant) | Jul 30–Aug 13 (transplant) |
| Sweet potato | – | Apr 3–17 (transplant) | – |
| Sweet corn | – | Mar 20–Apr 3 (sow outdoors) | – |
| Bean, bush (snap) | – | Mar 20–Apr 3 (sow outdoors) | Aug 27–Sep 10 (sowing) |
| Bean, pole | – | Mar 20–Apr 3 (sow outdoors) | – |
| Lima bean | – | Mar 27–Apr 10 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 3–24 (sow outdoors) | – |
| Cucumber | Feb 13–20 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | Aug 27–Sep 10 (sowing) |
| Summer squash / zucchini | Feb 13–20 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | Aug 27–Sep 10 (sowing) |
| Winter squash | Feb 13–20 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | – |
| Pumpkin | – | Mar 20–Apr 3 (sow outdoors) | – |
| Watermelon | Feb 13–20 | Mar 27–Apr 10 (transplant) Mar 27–Apr 10 (sow outdoors) | – |
| Cantaloupe / muskmelon | Feb 13–20 | Mar 27–Apr 10 (transplant) Mar 27–Apr 10 (sow outdoors) | – |
| Okra | Jan 30–Feb 13 | Mar 27–Apr 10 (transplant) Mar 27–Apr 10 (sow outdoors) | – |
| Celery | Dec 19–Jan 2 | Mar 20–27 (transplant) | – |
| Basil | Jan 30–Feb 13 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | – |
| Cilantro | – | Feb 27–Mar 27 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Parsley | Jan 2–16 | Feb 27–Mar 13 (transplant) Feb 20–Mar 13 (sow outdoors) | – |
| Dill | – | Mar 13–27 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Sunflower | – | Mar 13–27 (sow outdoors) | – |
| Asparagus (crowns) | – | Feb 13–27 (transplant) | – |
| Rhubarb (crowns) | – | Feb 13–27 (transplant) | – |
| Strawberry (plants) | – | Feb 13–27 (transplant) | Sep 10–Oct 8 (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: San Carlos Reservoir, AZ (NOAA GHCN-Daily ID USC00027480), elevation 2,532 ft, 16.4 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Ft Thomas 2 SW, AZ | 17 mi | Apr 1 | Nov 6 |
| Globe #3, AZ | 37 mi | Mar 11 | Nov 21 |
| Safford AG Ctr, AZ | 39 mi | Mar 25 | Nov 9 |
The average last-frost dates of these stations span 21 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85530
When is the last frost in 85530?
The average (50% chance) last spring freeze of 32°F for ZIP 85530 is March 13. For a more cautious planting date, use April 6, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85530?
The average first fall freeze is November 19. In 1 year in 10 it comes by November 3.
What hardiness zone is 85530?
ZIP 85530 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 85530 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
85536 Fort Thomas 85542 Peridot 85535 85543 Pima 85192 Dudleyville 85135 Hayden 85531 Central 85618
Other ZIP codes in Graham County
85531 85535 85536 85542 85543 85546 85551 85552 85643 All Graham County frost dates · Arizona frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- 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.