Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 98585 (Lewis County, WA)
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, Mayfield Pwr Plt, WA (9 miles away).
- Average last spring frostApr 750% chance of a 32°F freeze after this date
- Average first fall frostNov 1350% chance of a 32°F freeze by this date
- Growing season (frost-free)215 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 98585, 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
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 98585 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 March to April.
Fertilizer window
Lawn region: Pacific Northwest (west of the Cascades). Timing only; always follow the product label.
- 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 13: 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 7 |
| 10% (cautious: only 1 year in 10 freezes later) | May 8 |
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 24 |
| 50% (the "average" first frost) | Nov 13 |
| 90% (late: most years have frozen by now) | Dec 4 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 6 | Oct 24 |
| 32°F (freeze) | Apr 7 | Nov 13 |
| 28°F (hard freeze) | Mar 6 | Dec 1 |
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 98585
Dates count from your average last spring frost (Apr 7) and first fall frost (Nov 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 | Feb 10–24 | Apr 14–28 (transplant) | Jul 17–Aug 14 (transplant) |
| Pepper (sweet and hot) | Jan 27–Feb 10 | Apr 21–May 5 (transplant) | Jul 24–Aug 14 (transplant) |
| Eggplant | Jan 27–Feb 10 | Apr 21–May 5 (transplant) | Jul 24–Aug 14 (transplant) |
| Tomatillo | Feb 10–24 | Apr 14–28 (transplant) | – |
| Lettuce | Feb 10–24 | Mar 17–Apr 7 (transplant) Mar 10–Apr 21 (sow outdoors) | Sep 18–Oct 9 (transplant) Sep 4–Oct 2 (sowing) |
| Spinach | – | Feb 24–Mar 17 (sow outdoors) | Sep 18–Oct 9 (sowing) |
| Kale | Feb 10–24 | Mar 10–24 (transplant) Mar 10–24 (sow outdoors) | Aug 21–Sep 18 (transplant) Aug 7–Sep 4 (sowing) |
| Collards | Feb 10–24 | Mar 10–Apr 7 (transplant) Mar 10–Apr 7 (sow outdoors) | Aug 21–Sep 18 (transplant) Aug 7–Sep 4 (sowing) |
| Broccoli | Jan 27–Feb 10 | Mar 10–24 (transplant) | Aug 7–Sep 4 (transplant) |
| Cabbage | Jan 27–Feb 10 | Mar 10–24 (transplant) | Aug 7–Sep 4 (transplant) |
| Cauliflower | Jan 27–Feb 10 | Mar 24–Apr 7 (transplant) | Aug 7–Sep 4 (transplant) |
| Brussels sprouts | Jan 13–27 | Mar 10–24 (transplant) | Jul 24–Aug 14 (transplant) |
| Kohlrabi | Feb 10–24 | Mar 10–24 (transplant) Mar 10–24 (sow outdoors) | Sep 4–18 (sowing) |
| Bok choy / Asian greens | – | Mar 10–24 (sow outdoors) | Sep 18–Oct 2 (sowing) |
| Arugula | – | Mar 10–Apr 7 (sow outdoors) | Sep 18–Oct 16 (sowing) |
| Mustard greens | – | Mar 10–31 (sow outdoors) | Sep 18–Oct 2 (sowing) |
| Swiss chard | Feb 24–Mar 10 | Mar 24–Apr 14 (transplant) Mar 24–Apr 21 (sow outdoors) | Sep 4–18 (sowing) |
| Beet | – | Mar 10–Apr 7 (sow outdoors) | Sep 4–18 (sowing) |
| Carrot | – | Mar 17–Apr 14 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Radish | – | Mar 3–Apr 14 (sow outdoors) | Oct 2–16 (sowing) |
| Turnip | – | Mar 10–31 (sow outdoors) | Sep 4–18 (sowing) |
| Parsnip | – | Mar 17–Apr 7 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 10–Mar 10 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Onion (bulbing) | Jan 13–27 | Feb 24–Mar 10 (transplant) | – |
| Green onion / scallion | – | Feb 24–Mar 24 (sow outdoors) | Sep 4–18 (sowing) |
| Leek | Jan 13–27 | Mar 10–24 (transplant) | – |
| Garlic | – | – | Oct 2–30 (sowing) |
| Shallot | – | Feb 24–Mar 10 (transplant) | Oct 2–30 (sowing) |
| Potato | – | Mar 10–24 (transplant) | Jul 24–Aug 7 (transplant) |
| Sweet potato | – | Apr 28–May 12 (transplant) | – |
| Sweet corn | – | Apr 14–28 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 14–28 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Bean, pole | – | Apr 14–28 (sow outdoors) | – |
| Lima bean | – | Apr 21–May 5 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 28–May 19 (sow outdoors) | – |
| Cucumber | Mar 10–17 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Summer squash / zucchini | Mar 10–17 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Winter squash | Mar 10–17 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | – |
| Pumpkin | – | Apr 14–28 (sow outdoors) | – |
| Watermelon | Mar 10–17 | Apr 21–May 5 (transplant) Apr 21–May 5 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 10–17 | Apr 21–May 5 (transplant) Apr 21–May 5 (sow outdoors) | – |
| Okra | Feb 24–Mar 10 | Apr 21–May 5 (transplant) Apr 21–May 5 (sow outdoors) | – |
| Celery | Jan 13–27 | Apr 14–21 (transplant) | – |
| Basil | Feb 24–Mar 10 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | – |
| Cilantro | – | Mar 24–Apr 21 (sow outdoors) | Sep 18–Oct 2 (sowing) |
| Parsley | Jan 27–Feb 10 | Mar 24–Apr 7 (transplant) Mar 17–Apr 7 (sow outdoors) | – |
| Dill | – | Apr 7–21 (sow outdoors) | Sep 18–Oct 2 (sowing) |
| Sunflower | – | Apr 7–21 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 10–24 (transplant) | – |
| Rhubarb (crowns) | – | Mar 10–24 (transplant) | – |
| Strawberry (plants) | – | Mar 10–24 (transplant) | Sep 4–Oct 2 (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: Mayfield Pwr Plt, WA (NOAA GHCN-Daily ID USC00455110), elevation 280 ft, 8.6 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Glenoma, WA | 15 mi | Apr 24 | Oct 15 |
| Toledo FAA AP, WA | 19 mi | Apr 5 | Oct 25 |
| Centralia, WA | 26 mi | Apr 22 | Oct 27 |
The average last-frost dates of these stations span 19 days, a rough guide to local variation. See data sources & methods.
Frost questions for 98585
When is the last frost in 98585?
The average (50% chance) last spring freeze of 32°F for ZIP 98585 is April 7. For a more cautious planting date, use May 8, when only 1 year in 10 still sees a later freeze.
When is the first frost in 98585?
The average first fall freeze is November 13. In 1 year in 10 it comes by October 24.
What hardiness zone is 98585?
ZIP 98585 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 98585 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
98533 98356 Morton 98564 Mossyrock 98582 98570 Onalaska 98542 98591 Toledo 98336
Other ZIP codes in Lewis County
98336 98355 98356 98361 98377 98531 98532 98533 98538 98539 98542 98544 98564 98565 98570 98572 98582 98591 98593 98596 All Lewis County frost dates · Washington frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- 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.