Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85342 (Morristown, 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, Castle Hot Springs, AZ (6 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 83% of years (about 4 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 1550% chance of a 32°F freeze after this date
- Average first fall frostDec 2250% chance of a 32°F freeze by this date
- Growing season (frost-free)341 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
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 85342 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 2 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 13–Nov 10
- Kale: fall transplant Sep 29–Oct 27
- Collards: fall transplant Sep 29–Oct 27
- Kohlrabi: fall sowing Oct 13–27
- Swiss chard: fall sowing Oct 13–27
- Beet: fall sowing Oct 13–27
- Turnip: fall sowing Oct 13–27
- Green onion / scallion: fall sowing Oct 13–27
- Strawberry (plants): fall transplant Oct 13–Nov 10
Coming up in the next 3 weeks
- Pepper (sweet and hot): start seeds indoors Nov 6–20
- Eggplant: start seeds indoors Nov 6–20
- Lettuce: fall transplant Oct 27–Nov 17
- Spinach: fall sowing Oct 27–Nov 17
- Broccoli: start seeds indoors Nov 6–20
- Cabbage: start seeds indoors Nov 6–20
- Cauliflower: start seeds indoors Nov 6–20
- Brussels sprouts: start seeds indoors Oct 23–Nov 6
- Bok choy / Asian greens: fall sowing Oct 27–Nov 10
- Arugula: fall sowing Oct 27–Nov 24
- Mustard greens: fall sowing Oct 27–Nov 10
- Onion (bulbing): start seeds indoors Oct 23–Nov 6
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 19 (prior Dec) |
| 50% (the "average" last frost) | Jan 15 |
| 10% (cautious: only 1 year in 10 freezes later) | Feb 21 |
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 29 |
| 50% (the "average" first frost) | Dec 22 |
| 90% (late: most years have frozen by now) | Jan 26 (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 14 | Dec 7 |
| 32°F (freeze) | Jan 15 | Dec 22 |
| 28°F (hard freeze) | Jan 9 | Jan 6 (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 85342
Dates count from your average last spring frost (Jan 15) and first fall frost (Dec 22). 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 20–Dec 4 | Jan 22–Feb 5 (transplant) | Aug 25–Sep 22 (transplant) |
| Pepper (sweet and hot) | Nov 6–20 | Jan 29–Feb 12 (transplant) | Sep 1–22 (transplant) |
| Eggplant | Nov 6–20 | Jan 29–Feb 12 (transplant) | Sep 1–22 (transplant) |
| Tomatillo | Nov 20–Dec 4 | Jan 22–Feb 5 (transplant) | – |
| Lettuce | Nov 20–Dec 4 | Dec 25–Jan 15 (transplant) Dec 18–Jan 29 (sow outdoors) | Oct 27–Nov 17 (transplant) Oct 13–Nov 10 (sowing) |
| Spinach | – | Dec 4–25 (sow outdoors) | Oct 27–Nov 17 (sowing) |
| Kale | Nov 20–Dec 4 | Dec 18–Jan 1 (transplant) Dec 18–Jan 1 (sow outdoors) | Sep 29–Oct 27 (transplant) Sep 15–Oct 13 (sowing) |
| Collards | Nov 20–Dec 4 | Dec 18–Jan 15 (transplant) Dec 18–Jan 15 (sow outdoors) | Sep 29–Oct 27 (transplant) Sep 15–Oct 13 (sowing) |
| Broccoli | Nov 6–20 | Dec 18–Jan 1 (transplant) | Sep 15–Oct 13 (transplant) |
| Cabbage | Nov 6–20 | Dec 18–Jan 1 (transplant) | Sep 15–Oct 13 (transplant) |
| Cauliflower | Nov 6–20 | Jan 1–15 (transplant) | Sep 15–Oct 13 (transplant) |
| Brussels sprouts | Oct 23–Nov 6 | Dec 18–Jan 1 (transplant) | Sep 1–22 (transplant) |
| Kohlrabi | Nov 20–Dec 4 | Dec 18–Jan 1 (transplant) Dec 18–Jan 1 (sow outdoors) | Oct 13–27 (sowing) |
| Bok choy / Asian greens | – | Dec 18–Jan 1 (sow outdoors) | Oct 27–Nov 10 (sowing) |
| Arugula | – | Dec 18–Jan 15 (sow outdoors) | Oct 27–Nov 24 (sowing) |
| Mustard greens | – | Dec 18–Jan 8 (sow outdoors) | Oct 27–Nov 10 (sowing) |
| Swiss chard | Dec 4–18 | Jan 1–22 (transplant) Jan 1–29 (sow outdoors) | Oct 13–27 (sowing) |
| Beet | – | Dec 18–Jan 15 (sow outdoors) | Oct 13–27 (sowing) |
| Carrot | – | Dec 25–Jan 22 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Radish | – | Dec 11–Jan 22 (sow outdoors) | Nov 10–24 (sowing) |
| Turnip | – | Dec 18–Jan 8 (sow outdoors) | Oct 13–27 (sowing) |
| Parsnip | – | Dec 25–Jan 15 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Nov 20–Dec 18 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Onion (bulbing) | Oct 23–Nov 6 | Dec 4–18 (transplant) | – |
| Green onion / scallion | – | Dec 4–Jan 1 (sow outdoors) | Oct 13–27 (sowing) |
| Leek | Oct 23–Nov 6 | Dec 18–Jan 1 (transplant) | – |
| Garlic | – | – | Nov 10–Dec 8 (sowing) |
| Shallot | – | Dec 4–18 (transplant) | Nov 10–Dec 8 (sowing) |
| Potato | – | Dec 18–Jan 1 (transplant) | Sep 1–15 (transplant) |
| Sweet potato | – | Feb 5–19 (transplant) | – |
| Sweet corn | – | Jan 22–Feb 5 (sow outdoors) | – |
| Bean, bush (snap) | – | Jan 22–Feb 5 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Bean, pole | – | Jan 22–Feb 5 (sow outdoors) | – |
| Lima bean | – | Jan 29–Feb 12 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 5–26 (sow outdoors) | – |
| Cucumber | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Summer squash / zucchini | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Winter squash | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Pumpkin | – | Jan 22–Feb 5 (sow outdoors) | – |
| Watermelon | Dec 18–25 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 18–25 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Okra | Dec 4–18 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Celery | Oct 23–Nov 6 | Jan 22–29 (transplant) | – |
| Basil | Dec 4–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Cilantro | – | Jan 1–29 (sow outdoors) | Oct 27–Nov 10 (sowing) |
| Parsley | Nov 6–20 | Jan 1–15 (transplant) Dec 25–Jan 15 (sow outdoors) | – |
| Dill | – | Jan 15–29 (sow outdoors) | Oct 27–Nov 10 (sowing) |
| Sunflower | – | Jan 15–29 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 18–Jan 1 (transplant) | – |
| Rhubarb (crowns) | – | Dec 18–Jan 1 (transplant) | – |
| Strawberry (plants) | – | Dec 18–Jan 1 (transplant) | Oct 13–Nov 10 (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: Castle Hot Springs, AZ (NOAA GHCN-Daily ID USC00021353), elevation 1,990 ft, 5.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Wittmann 1SE, AZ | 12 mi | Feb 5 | Dec 11 |
| Wickenburg, AZ | 17 mi | Mar 7 | Nov 20 |
| Youngtown, AZ | 26 mi | Jan 20 | Dec 15 |
The average last-frost dates of these stations span 54 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85342
When is the last frost in 85342?
The average (50% chance) last spring freeze of 32°F for ZIP 85342 is January 15. For a more cautious planting date, use February 21, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85342?
The average first fall freeze is December 22. In 1 year in 10 it comes by November 29.
What hardiness zone is 85342?
ZIP 85342 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 85342 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.
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Other ZIP codes in Yavapai County
85324 85332 85362 86301 86303 86305 86313 86314 86315 86321 86322 86323 86324 86325 86326 86327 86329 86331 86332 86333 86334 86335 86336 86337 All Yavapai County frost dates · Arizona frost dates
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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.