Fall in zone 6bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 83522 (Cottonwood, ID)
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, Cottonwood 2 WSW, ID (9 miles away).
- Average last spring frostMay 650% chance of a 32°F freeze after this date
- Average first fall frostOct 1350% chance of a 32°F freeze by this date
- Growing season (frost-free)156 daysmedian, 32°F threshold
- USDA hardiness zone6b-5 to 0°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 83522 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) | Apr 22 |
| 50% (the "average" last frost) | May 6 |
| 10% (cautious: only 1 year in 10 freezes later) | May 26 |
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 13 |
| 90% (late: most years have frozen by now) | Oct 27 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 31 | Oct 1 |
| 32°F (freeze) | May 6 | Oct 13 |
| 28°F (hard freeze) | Apr 21 | Oct 24 |
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 83522
Dates count from your average last spring frost (May 6) and first fall frost (Oct 13). 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 11–25 | May 13–27 (transplant) | – |
| Pepper (sweet and hot) | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Eggplant | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Tomatillo | Mar 11–25 | May 13–27 (transplant) | – |
| Lettuce | Mar 11–25 | Apr 15–May 6 (transplant) Apr 8–May 20 (sow outdoors) | Aug 18–Sep 8 (transplant) Aug 4–Sep 1 (sowing) |
| Spinach | – | Mar 25–Apr 15 (sow outdoors) | Aug 18–Sep 8 (sowing) |
| Kale | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Jul 21–Aug 18 (transplant) Jul 7–Aug 4 (sowing) |
| Collards | Mar 11–25 | Apr 8–May 6 (transplant) Apr 8–May 6 (sow outdoors) | Jul 21–Aug 18 (transplant) Jul 7–Aug 4 (sowing) |
| Broccoli | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jul 7–Aug 4 (transplant) |
| Cabbage | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jul 7–Aug 4 (transplant) |
| Cauliflower | Feb 25–Mar 11 | Apr 22–May 6 (transplant) | Jul 7–Aug 4 (transplant) |
| Brussels sprouts | Feb 11–25 | Apr 8–22 (transplant) | Jun 23–Jul 14 (transplant) |
| Kohlrabi | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Aug 4–18 (sowing) |
| Bok choy / Asian greens | – | Apr 8–22 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Arugula | – | Apr 8–May 6 (sow outdoors) | Aug 18–Sep 15 (sowing) |
| Mustard greens | – | Apr 8–29 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Swiss chard | Mar 25–Apr 8 | Apr 22–May 13 (transplant) Apr 22–May 20 (sow outdoors) | Aug 4–18 (sowing) |
| Beet | – | Apr 8–May 6 (sow outdoors) | Aug 4–18 (sowing) |
| Carrot | – | Apr 15–May 13 (sow outdoors) | Jul 21–Aug 4 (sowing) |
| Radish | – | Apr 1–May 13 (sow outdoors) | Sep 1–15 (sowing) |
| Turnip | – | Apr 8–29 (sow outdoors) | Aug 4–18 (sowing) |
| Parsnip | – | Apr 15–May 6 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 11–Apr 8 (sow outdoors) | Jul 21–Aug 4 (sowing) |
| Onion (bulbing) | Feb 11–25 | Mar 25–Apr 8 (transplant) | – |
| Green onion / scallion | – | Mar 25–Apr 22 (sow outdoors) | Aug 4–18 (sowing) |
| Leek | Feb 11–25 | Apr 8–22 (transplant) | – |
| Garlic | – | – | Sep 1–29 (sowing) |
| Shallot | – | Mar 25–Apr 8 (transplant) | Sep 1–29 (sowing) |
| Potato | – | Apr 8–22 (transplant) | Jun 23–Jul 7 (transplant) |
| Sweet potato | – | May 27–Jun 10 (transplant) | – |
| Sweet corn | – | May 13–27 (sow outdoors) | – |
| Bean, bush (snap) | – | May 13–27 (sow outdoors) | – |
| Bean, pole | – | May 13–27 (sow outdoors) | – |
| Lima bean | – | May 20–Jun 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 27–Jun 17 (sow outdoors) | – |
| Cucumber | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Summer squash / zucchini | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Winter squash | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Pumpkin | – | May 13–27 (sow outdoors) | – |
| Watermelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Okra | Mar 25–Apr 8 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Celery | Feb 11–25 | May 13–20 (transplant) | – |
| Basil | Mar 25–Apr 8 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Cilantro | – | Apr 22–May 20 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Parsley | Feb 25–Mar 11 | Apr 22–May 6 (transplant) Apr 15–May 6 (sow outdoors) | – |
| Dill | – | May 6–20 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Sunflower | – | May 6–20 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 8–22 (transplant) | – |
| Rhubarb (crowns) | – | Apr 8–22 (transplant) | – |
| Strawberry (plants) | – | Apr 8–22 (transplant) | Aug 4–Sep 1 (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: Cottonwood 2 WSW, ID (NOAA GHCN-Daily ID USC00102159), elevation 3,945 ft, 9.2 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Grangeville, ID | 17 mi | May 9 | Oct 3 |
| Winchester, ID | 24 mi | May 23 | Sep 25 |
| Nezperce, ID | 25 mi | May 24 | Sep 20 |
The average last-frost dates of these stations span 18 days, a rough guide to local variation. See data sources & methods.
Frost questions for 83522
When is the last frost in 83522?
The average (50% chance) last spring freeze of 32°F for ZIP 83522 is May 6. For a more cautious planting date, use May 26, when only 1 year in 10 still sees a later freeze.
When is the first frost in 83522?
The average first fall freeze is October 13. In 1 year in 10 it comes by September 28.
What hardiness zone is 83522?
ZIP 83522 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 83522 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
83555 Winchester 83526 Ferdinand 83533 83554 White Bird 83523 Craigmont 83530 Grangeville 83542 97842
Other ZIP codes in Idaho County
83525 83526 83530 83533 83536 83539 83542 83547 83549 83552 83554 All Idaho County frost dates · Idaho 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.