Fall in zone 6bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 86052 (Coconino 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, Bright Angel Rs, AZ (7 miles away).
- Average last spring frostJun 350% chance of a 32°F freeze after this date
- Average first fall frostSep 2750% chance of a 32°F freeze by this date
- Growing season (frost-free)113 daysmedian, 32°F threshold
- USDA hardiness zone6b-5 to 0°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 86052, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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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
48°F Below 50°F
24-hour average · latest 48°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Williams 35 NNW (38 mi).
4-inch depth
51°F 50–55°F
24-hour average · latest 51°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Williams 35 NNW (38 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 86052 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 51°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically 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 16 |
| 50% (the "average" last frost) | Jun 3 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 19 |
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 12 |
| 50% (the "average" first frost) | Sep 27 |
| 90% (late: most years have frozen by now) | Oct 10 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 16 | Sep 15 |
| 32°F (freeze) | Jun 3 | Sep 27 |
| 28°F (hard freeze) | May 19 | Oct 6 |
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 86052
Dates count from your average last spring frost (Jun 3) and first fall frost (Sep 27). 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 | Apr 8–22 | Jun 10–24 (transplant) | – |
| Pepper (sweet and hot) | Mar 25–Apr 8 | Jun 17–Jul 1 (transplant) | – |
| Eggplant | Mar 25–Apr 8 | Jun 17–Jul 1 (transplant) | – |
| Tomatillo | Apr 8–22 | Jun 10–24 (transplant) | – |
| Lettuce | Apr 8–22 | May 13–Jun 3 (transplant) May 6–Jun 17 (sow outdoors) | Aug 2–23 (transplant) Jul 19–Aug 16 (sowing) |
| Spinach | – | Apr 22–May 13 (sow outdoors) | Aug 2–23 (sowing) |
| Kale | Apr 8–22 | May 6–20 (transplant) May 6–20 (sow outdoors) | Jul 5–Aug 2 (transplant) Jun 21–Jul 19 (sowing) |
| Collards | Apr 8–22 | May 6–Jun 3 (transplant) May 6–Jun 3 (sow outdoors) | Jul 5–Aug 2 (transplant) Jun 21–Jul 19 (sowing) |
| Broccoli | Mar 25–Apr 8 | May 6–20 (transplant) | Jun 21–Jul 19 (transplant) |
| Cabbage | Mar 25–Apr 8 | May 6–20 (transplant) | Jun 21–Jul 19 (transplant) |
| Cauliflower | Mar 25–Apr 8 | May 20–Jun 3 (transplant) | Jun 21–Jul 19 (transplant) |
| Brussels sprouts | Mar 11–25 | May 6–20 (transplant) | Jun 7–28 (transplant) |
| Kohlrabi | Apr 8–22 | May 6–20 (transplant) May 6–20 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Bok choy / Asian greens | – | May 6–20 (sow outdoors) | Aug 2–16 (sowing) |
| Arugula | – | May 6–Jun 3 (sow outdoors) | Aug 2–30 (sowing) |
| Mustard greens | – | May 6–27 (sow outdoors) | Aug 2–16 (sowing) |
| Swiss chard | Apr 22–May 6 | May 20–Jun 10 (transplant) May 20–Jun 17 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Beet | – | May 6–Jun 3 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Carrot | – | May 13–Jun 10 (sow outdoors) | Jul 5–19 (sowing) |
| Radish | – | Apr 29–Jun 10 (sow outdoors) | Aug 16–30 (sowing) |
| Turnip | – | May 6–27 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Parsnip | – | May 13–Jun 3 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 8–May 6 (sow outdoors) | Jul 5–19 (sowing) |
| Onion (bulbing) | Mar 11–25 | Apr 22–May 6 (transplant) | – |
| Green onion / scallion | – | Apr 22–May 20 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Leek | Mar 11–25 | May 6–20 (transplant) | – |
| Garlic | – | – | Aug 16–Sep 13 (sowing) |
| Shallot | – | Apr 22–May 6 (transplant) | Aug 16–Sep 13 (sowing) |
| Potato | – | May 6–20 (transplant) | Jun 7–21 (transplant) |
| Sweet potato | – | Jun 24–Jul 8 (transplant) | – |
| Sweet corn | – | Jun 10–24 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 10–24 (sow outdoors) | – |
| Bean, pole | – | Jun 10–24 (sow outdoors) | – |
| Lima bean | – | Jun 17–Jul 1 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 24–Jul 15 (sow outdoors) | – |
| Cucumber | May 6–13 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Summer squash / zucchini | May 6–13 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Winter squash | May 6–13 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Pumpkin | – | Jun 10–24 (sow outdoors) | – |
| Watermelon | May 6–13 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 6–13 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Okra | Apr 22–May 6 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Celery | Mar 11–25 | Jun 10–17 (transplant) | – |
| Basil | Apr 22–May 6 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Cilantro | – | May 20–Jun 17 (sow outdoors) | Aug 2–16 (sowing) |
| Parsley | Mar 25–Apr 8 | May 20–Jun 3 (transplant) May 13–Jun 3 (sow outdoors) | – |
| Dill | – | Jun 3–17 (sow outdoors) | Aug 2–16 (sowing) |
| Sunflower | – | Jun 3–17 (sow outdoors) | – |
| Asparagus (crowns) | – | May 6–20 (transplant) | – |
| Rhubarb (crowns) | – | May 6–20 (transplant) | – |
| Strawberry (plants) | – | May 6–20 (transplant) | Jul 19–Aug 16 (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: Bright Angel Rs, AZ (NOAA GHCN-Daily ID USC00021001), elevation 8,000 ft, 6.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Phantom Rch, AZ | 13 mi | Feb 9 | Dec 5 |
| Grand Canyon Visitor Ctr, AZ | 16 mi | May 2 | Oct 27 |
| Grand Canyon Np 2, AZ | 16 mi | Jun 1 | Oct 3 |
The average last-frost dates of these stations span 118 days, a rough guide to local variation. See data sources & methods.
Frost questions for 86052
When is the last frost in 86052?
The average (50% chance) last spring freeze of 32°F for ZIP 86052 is June 3. For a more cautious planting date, use June 19, when only 1 year in 10 still sees a later freeze.
When is the first frost in 86052?
The average first fall freeze is September 27. In 1 year in 10 it comes by September 12.
What hardiness zone is 86052?
ZIP 86052 is in USDA zone 6b (-5 to 0°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 86052 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
86023 Grand Canyon Village 86036 86022 Fredonia 86020 Cameron 86016 86435 Supai 86040 Page 86045 Tuba City
Other ZIP codes in Coconino County
85931 86001 86003 86004 86005 86011 86015 86016 86017 86018 86020 86022 86023 86024 86030 86035 86036 86038 86040 86044 86045 86046 86053 86320 All Coconino 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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- 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.