Fall in zone 8aPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 86434 (Grand Canyon West, 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, Diamond M Rch, AZ (28 miles away).
Station is a bit far
The nearest station with freeze normals is over 40 km away, so dates here may be off by a week or more.
- Average last spring frostMay 1750% chance of a 32°F freeze after this date
- Average first fall frostOct 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)146 daysmedian, 32°F threshold
- USDA hardiness zone8a10 to 15°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 86434 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 mid-April to mid-May.
Fertilizer window
Lawn region: Mountain West and High Plains. Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
No vegetable planting windows are open this week.
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) | May 1 |
| 50% (the "average" last frost) | May 17 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 4 |
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) | Sep 28 |
| 50% (the "average" first frost) | Oct 10 |
| 90% (late: most years have frozen by now) | Oct 26 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 2 | Oct 1 |
| 32°F (freeze) | May 17 | Oct 10 |
| 28°F (hard freeze) | Apr 30 | Oct 23 |
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 86434
Dates count from your average last spring frost (May 17) and first fall frost (Oct 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 | Mar 22–Apr 5 | May 24–Jun 7 (transplant) | – |
| Pepper (sweet and hot) | Mar 8–22 | May 31–Jun 14 (transplant) | – |
| Eggplant | Mar 8–22 | May 31–Jun 14 (transplant) | – |
| Tomatillo | Mar 22–Apr 5 | May 24–Jun 7 (transplant) | – |
| Lettuce | Mar 22–Apr 5 | Apr 26–May 17 (transplant) Apr 19–May 31 (sow outdoors) | Aug 15–Sep 5 (transplant) Aug 1–29 (sowing) |
| Spinach | – | Apr 5–26 (sow outdoors) | Aug 15–Sep 5 (sowing) |
| Kale | Mar 22–Apr 5 | Apr 19–May 3 (transplant) Apr 19–May 3 (sow outdoors) | Jul 18–Aug 15 (transplant) Jul 4–Aug 1 (sowing) |
| Collards | Mar 22–Apr 5 | Apr 19–May 17 (transplant) Apr 19–May 17 (sow outdoors) | Jul 18–Aug 15 (transplant) Jul 4–Aug 1 (sowing) |
| Broccoli | Mar 8–22 | Apr 19–May 3 (transplant) | Jul 4–Aug 1 (transplant) |
| Cabbage | Mar 8–22 | Apr 19–May 3 (transplant) | Jul 4–Aug 1 (transplant) |
| Cauliflower | Mar 8–22 | May 3–17 (transplant) | Jul 4–Aug 1 (transplant) |
| Brussels sprouts | Feb 22–Mar 8 | Apr 19–May 3 (transplant) | Jun 20–Jul 11 (transplant) |
| Kohlrabi | Mar 22–Apr 5 | Apr 19–May 3 (transplant) Apr 19–May 3 (sow outdoors) | Aug 1–15 (sowing) |
| Bok choy / Asian greens | – | Apr 19–May 3 (sow outdoors) | Aug 15–29 (sowing) |
| Arugula | – | Apr 19–May 17 (sow outdoors) | Aug 15–Sep 12 (sowing) |
| Mustard greens | – | Apr 19–May 10 (sow outdoors) | Aug 15–29 (sowing) |
| Swiss chard | Apr 5–19 | May 3–24 (transplant) May 3–31 (sow outdoors) | Aug 1–15 (sowing) |
| Beet | – | Apr 19–May 17 (sow outdoors) | Aug 1–15 (sowing) |
| Carrot | – | Apr 26–May 24 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Radish | – | Apr 12–May 24 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Turnip | – | Apr 19–May 10 (sow outdoors) | Aug 1–15 (sowing) |
| Parsnip | – | Apr 26–May 17 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 22–Apr 19 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Onion (bulbing) | Feb 22–Mar 8 | Apr 5–19 (transplant) | – |
| Green onion / scallion | – | Apr 5–May 3 (sow outdoors) | Aug 1–15 (sowing) |
| Leek | Feb 22–Mar 8 | Apr 19–May 3 (transplant) | – |
| Garlic | – | – | Aug 29–Sep 26 (sowing) |
| Shallot | – | Apr 5–19 (transplant) | Aug 29–Sep 26 (sowing) |
| Potato | – | Apr 19–May 3 (transplant) | Jun 20–Jul 4 (transplant) |
| Sweet potato | – | Jun 7–21 (transplant) | – |
| Sweet corn | – | May 24–Jun 7 (sow outdoors) | – |
| Bean, bush (snap) | – | May 24–Jun 7 (sow outdoors) | – |
| Bean, pole | – | May 24–Jun 7 (sow outdoors) | – |
| Lima bean | – | May 31–Jun 14 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 7–28 (sow outdoors) | – |
| Cucumber | Apr 19–26 | May 24–Jun 7 (transplant) May 24–Jun 7 (sow outdoors) | – |
| Summer squash / zucchini | Apr 19–26 | May 24–Jun 7 (transplant) May 24–Jun 7 (sow outdoors) | – |
| Winter squash | Apr 19–26 | May 24–Jun 7 (transplant) May 24–Jun 7 (sow outdoors) | – |
| Pumpkin | – | May 24–Jun 7 (sow outdoors) | – |
| Watermelon | Apr 19–26 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 19–26 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Okra | Apr 5–19 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Celery | Feb 22–Mar 8 | May 24–31 (transplant) | – |
| Basil | Apr 5–19 | May 24–Jun 7 (transplant) May 24–Jun 7 (sow outdoors) | – |
| Cilantro | – | May 3–31 (sow outdoors) | Aug 15–29 (sowing) |
| Parsley | Mar 8–22 | May 3–17 (transplant) Apr 26–May 17 (sow outdoors) | – |
| Dill | – | May 17–31 (sow outdoors) | Aug 15–29 (sowing) |
| Sunflower | – | May 17–31 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 19–May 3 (transplant) | – |
| Rhubarb (crowns) | – | Apr 19–May 3 (transplant) | – |
| Strawberry (plants) | – | Apr 19–May 3 (transplant) | Aug 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: Diamond M Rch, AZ (NOAA GHCN-Daily ID USC00022527), elevation 5,492 ft, 28.0 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Kingman Mohave Co AP, AZ | 34 mi | Apr 2 | Nov 11 |
| Meadview 1W, AZ | 37 mi | Mar 5 | Nov 28 |
| Seligman, AZ | 46 mi | May 10 | Oct 15 |
The average last-frost dates of these stations span 74 days, a rough guide to local variation. See data sources & methods.
Frost questions for 86434
When is the last frost in 86434?
The average (50% chance) last spring freeze of 32°F for ZIP 86434 is May 17. For a more cautious planting date, use June 4, when only 1 year in 10 still sees a later freeze.
When is the first frost in 86434?
The average first fall freeze is October 10. In 1 year in 10 it comes by September 28.
What hardiness zone is 86434?
ZIP 86434 is in USDA zone 8a (10 to 15°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 86434 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
86411 Hackberry 86437 Valentine 86409 New Kingman-Butler 86444 Meadview 86401 Kingman 86431 Chloride 86441 Dolan Springs 86337 Seligman
Other ZIP codes in Mohave County
85360 86021 86401 86403 86404 86406 86409 86411 86413 86426 86429 86431 86432 86433 86436 86437 86438 86440 86441 86442 86443 86444 86445 All Mohave 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.