Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 85658 (Marana, 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, Catalina Sp, AZ (15 miles away).
- Average last spring frostApr 250% chance of a 32°F freeze after this date
- Average first fall frostNov 1150% chance of a 32°F freeze by this date
- Growing season (frost-free)222 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
Soil temperature now
2-inch depth
76°F 55°F or warmer
24-hour average · latest 73°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Tucson 11 W (19 mi).
4-inch depth
76°F 55°F or warmer
24-hour average · latest 75°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Tucson 11 W (19 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 85658 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 76°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): not yet. Apply as soil cools toward 70°F (typically 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 May 18 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
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 11: 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) | Mar 16 |
| 50% (the "average" last frost) | Apr 2 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 18 |
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) | Oct 26 |
| 50% (the "average" first frost) | Nov 11 |
| 90% (late: most years have frozen by now) | Nov 29 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 18 | Nov 1 |
| 32°F (freeze) | Apr 2 | Nov 11 |
| 28°F (hard freeze) | Mar 12 | Nov 21 |
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 85658
Dates count from your average last spring frost (Apr 2) and first fall frost (Nov 11). 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 | Feb 5–19 | Apr 9–23 (transplant) | Jul 15–Aug 12 (transplant) |
| Pepper (sweet and hot) | Jan 22–Feb 5 | Apr 16–30 (transplant) | Jul 22–Aug 12 (transplant) |
| Eggplant | Jan 22–Feb 5 | Apr 16–30 (transplant) | Jul 22–Aug 12 (transplant) |
| Tomatillo | Feb 5–19 | Apr 9–23 (transplant) | – |
| Lettuce | Feb 5–19 | Mar 12–Apr 2 (transplant) Mar 5–Apr 16 (sow outdoors) | Sep 16–Oct 7 (transplant) Sep 2–30 (sowing) |
| Spinach | – | Feb 19–Mar 12 (sow outdoors) | Sep 16–Oct 7 (sowing) |
| Kale | Feb 5–19 | Mar 5–19 (transplant) Mar 5–19 (sow outdoors) | Aug 19–Sep 16 (transplant) Aug 5–Sep 2 (sowing) |
| Collards | Feb 5–19 | Mar 5–Apr 2 (transplant) Mar 5–Apr 2 (sow outdoors) | Aug 19–Sep 16 (transplant) Aug 5–Sep 2 (sowing) |
| Broccoli | Jan 22–Feb 5 | Mar 5–19 (transplant) | Aug 5–Sep 2 (transplant) |
| Cabbage | Jan 22–Feb 5 | Mar 5–19 (transplant) | Aug 5–Sep 2 (transplant) |
| Cauliflower | Jan 22–Feb 5 | Mar 19–Apr 2 (transplant) | Aug 5–Sep 2 (transplant) |
| Brussels sprouts | Jan 8–22 | Mar 5–19 (transplant) | Jul 22–Aug 12 (transplant) |
| Kohlrabi | Feb 5–19 | Mar 5–19 (transplant) Mar 5–19 (sow outdoors) | Sep 2–16 (sowing) |
| Bok choy / Asian greens | – | Mar 5–19 (sow outdoors) | Sep 16–30 (sowing) |
| Arugula | – | Mar 5–Apr 2 (sow outdoors) | Sep 16–Oct 14 (sowing) |
| Mustard greens | – | Mar 5–26 (sow outdoors) | Sep 16–30 (sowing) |
| Swiss chard | Feb 19–Mar 5 | Mar 19–Apr 9 (transplant) Mar 19–Apr 16 (sow outdoors) | Sep 2–16 (sowing) |
| Beet | – | Mar 5–Apr 2 (sow outdoors) | Sep 2–16 (sowing) |
| Carrot | – | Mar 12–Apr 9 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Radish | – | Feb 26–Apr 9 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Turnip | – | Mar 5–26 (sow outdoors) | Sep 2–16 (sowing) |
| Parsnip | – | Mar 12–Apr 2 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 5–Mar 5 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Onion (bulbing) | Jan 8–22 | Feb 19–Mar 5 (transplant) | – |
| Green onion / scallion | – | Feb 19–Mar 19 (sow outdoors) | Sep 2–16 (sowing) |
| Leek | Jan 8–22 | Mar 5–19 (transplant) | – |
| Garlic | – | – | Sep 30–Oct 28 (sowing) |
| Shallot | – | Feb 19–Mar 5 (transplant) | Sep 30–Oct 28 (sowing) |
| Potato | – | Mar 5–19 (transplant) | Jul 22–Aug 5 (transplant) |
| Sweet potato | – | Apr 23–May 7 (transplant) | – |
| Sweet corn | – | Apr 9–23 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 9–23 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Bean, pole | – | Apr 9–23 (sow outdoors) | – |
| Lima bean | – | Apr 16–30 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 23–May 14 (sow outdoors) | – |
| Cucumber | Mar 5–12 | Apr 9–23 (transplant) Apr 9–23 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Summer squash / zucchini | Mar 5–12 | Apr 9–23 (transplant) Apr 9–23 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Winter squash | Mar 5–12 | Apr 9–23 (transplant) Apr 9–23 (sow outdoors) | – |
| Pumpkin | – | Apr 9–23 (sow outdoors) | – |
| Watermelon | Mar 5–12 | Apr 16–30 (transplant) Apr 16–30 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 5–12 | Apr 16–30 (transplant) Apr 16–30 (sow outdoors) | – |
| Okra | Feb 19–Mar 5 | Apr 16–30 (transplant) Apr 16–30 (sow outdoors) | – |
| Celery | Jan 8–22 | Apr 9–16 (transplant) | – |
| Basil | Feb 19–Mar 5 | Apr 9–23 (transplant) Apr 9–23 (sow outdoors) | – |
| Cilantro | – | Mar 19–Apr 16 (sow outdoors) | Sep 16–30 (sowing) |
| Parsley | Jan 22–Feb 5 | Mar 19–Apr 2 (transplant) Mar 12–Apr 2 (sow outdoors) | – |
| Dill | – | Apr 2–16 (sow outdoors) | Sep 16–30 (sowing) |
| Sunflower | – | Apr 2–16 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 5–19 (transplant) | – |
| Rhubarb (crowns) | – | Mar 5–19 (transplant) | – |
| Strawberry (plants) | – | Mar 5–19 (transplant) | Sep 2–30 (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: Catalina Sp, AZ (NOAA GHCN-Daily ID USC00021357), elevation 2,707 ft, 14.6 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Tohono Chul, AZ | 16 mi | Feb 26 | Dec 4 |
| Picacho 8 SE, AZ | 17 mi | Feb 6 | Dec 9 |
| Tucson 17 NW, AZ | 18 mi | Feb 23 | Dec 6 |
The average last-frost dates of these stations span 58 days, a rough guide to local variation. See data sources & methods.
Frost questions for 85658
When is the last frost in 85658?
The average (50% chance) last spring freeze of 32°F for ZIP 85658 is April 2. For a more cautious planting date, use April 18, when only 1 year in 10 still sees a later freeze.
When is the first frost in 85658?
The average first fall freeze is November 11. In 1 year in 10 it comes by October 26.
What hardiness zone is 85658?
ZIP 85658 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 85658 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
85654 Rillito 85755 Oro Valley 85742 Casas Adobes 85739 Saddlebrooke 85737 Oro Valley 85145 Red Rock 85741 Casas Adobes 85743 Picture Rocks
Other ZIP codes in Pinal County
85118 85119 85120 85121 85122 85123 85128 85131 85132 85137 85138 85139 85140 85141 85142 85143 85145 85147 85172 85173 85191 85192 85193 85194 All Pinal 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.