Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 98446 (Clover Creek, 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, Mcmillin Rsvr, WA (6 miles away).
- Average last spring frostApr 1150% chance of a 32°F freeze after this date
- Average first fall frostOct 3050% chance of a 32°F freeze by this date
- Growing season (frost-free)202 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°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 98446 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
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Oct 30: 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 23 |
| 50% (the "average" last frost) | Apr 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 29 |
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 13 |
| 50% (the "average" first frost) | Oct 30 |
| 90% (late: most years have frozen by now) | Nov 17 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 1 | Oct 12 |
| 32°F (freeze) | Apr 11 | Oct 30 |
| 28°F (hard freeze) | Mar 16 | Nov 14 |
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 98446
Dates count from your average last spring frost (Apr 11) and first fall frost (Oct 30). 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 14–28 | Apr 18–May 2 (transplant) | – |
| Pepper (sweet and hot) | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Eggplant | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Tomatillo | Feb 14–28 | Apr 18–May 2 (transplant) | – |
| Lettuce | Feb 14–28 | Mar 21–Apr 11 (transplant) Mar 14–Apr 25 (sow outdoors) | Sep 4–25 (transplant) Aug 21–Sep 18 (sowing) |
| Spinach | – | Feb 28–Mar 21 (sow outdoors) | Sep 4–25 (sowing) |
| Kale | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 7–Sep 4 (transplant) Jul 24–Aug 21 (sowing) |
| Collards | Feb 14–28 | Mar 14–Apr 11 (transplant) Mar 14–Apr 11 (sow outdoors) | Aug 7–Sep 4 (transplant) Jul 24–Aug 21 (sowing) |
| Broccoli | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 24–Aug 21 (transplant) |
| Cabbage | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 24–Aug 21 (transplant) |
| Cauliflower | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) | Jul 24–Aug 21 (transplant) |
| Brussels sprouts | Jan 17–31 | Mar 14–28 (transplant) | Jul 10–31 (transplant) |
| Kohlrabi | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Bok choy / Asian greens | – | Mar 14–28 (sow outdoors) | Sep 4–18 (sowing) |
| Arugula | – | Mar 14–Apr 11 (sow outdoors) | Sep 4–Oct 2 (sowing) |
| Mustard greens | – | Mar 14–Apr 4 (sow outdoors) | Sep 4–18 (sowing) |
| Swiss chard | Feb 28–Mar 14 | Mar 28–Apr 18 (transplant) Mar 28–Apr 25 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Beet | – | Mar 14–Apr 11 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Carrot | – | Mar 21–Apr 18 (sow outdoors) | Aug 7–21 (sowing) |
| Radish | – | Mar 7–Apr 18 (sow outdoors) | Sep 18–Oct 2 (sowing) |
| Turnip | – | Mar 14–Apr 4 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Parsnip | – | Mar 21–Apr 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 14–Mar 14 (sow outdoors) | Aug 7–21 (sowing) |
| Onion (bulbing) | Jan 17–31 | Feb 28–Mar 14 (transplant) | – |
| Green onion / scallion | – | Feb 28–Mar 28 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Leek | Jan 17–31 | Mar 14–28 (transplant) | – |
| Garlic | – | – | Sep 18–Oct 16 (sowing) |
| Shallot | – | Feb 28–Mar 14 (transplant) | Sep 18–Oct 16 (sowing) |
| Potato | – | Mar 14–28 (transplant) | Jul 10–24 (transplant) |
| Sweet potato | – | May 2–16 (transplant) | – |
| Sweet corn | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, pole | – | Apr 18–May 2 (sow outdoors) | – |
| Lima bean | – | Apr 25–May 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 2–23 (sow outdoors) | – |
| Cucumber | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Summer squash / zucchini | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Winter squash | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Pumpkin | – | Apr 18–May 2 (sow outdoors) | – |
| Watermelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Okra | Feb 28–Mar 14 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Celery | Jan 17–31 | Apr 18–25 (transplant) | – |
| Basil | Feb 28–Mar 14 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Cilantro | – | Mar 28–Apr 25 (sow outdoors) | Sep 4–18 (sowing) |
| Parsley | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) Mar 21–Apr 11 (sow outdoors) | – |
| Dill | – | Apr 11–25 (sow outdoors) | Sep 4–18 (sowing) |
| Sunflower | – | Apr 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 14–28 (transplant) | – |
| Rhubarb (crowns) | – | Mar 14–28 (transplant) | – |
| Strawberry (plants) | – | Mar 14–28 (transplant) | Aug 21–Sep 18 (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: Mcmillin Rsvr, WA (NOAA GHCN-Daily ID USC00455224), elevation 579 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%) |
|---|---|---|---|
| Tacoma #1, WA | 8 mi | Mar 8 | Nov 14 |
| Tacoma Narrows AP, WA | 13 mi | Mar 11 | Nov 21 |
| Buckley 1 NE, WA | 18 mi | Apr 7 | Oct 30 |
The average last-frost dates of these stations span 34 days, a rough guide to local variation. See data sources & methods.
Frost questions for 98446
When is the last frost in 98446?
The average (50% chance) last spring freeze of 32°F for ZIP 98446 is April 11. For a more cautious planting date, use April 29, when only 1 year in 10 still sees a later freeze.
When is the first frost in 98446?
The average first fall freeze is October 30. In 1 year in 10 it comes by October 13.
What hardiness zone is 98446?
ZIP 98446 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 98446 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
98445 Parkland 98373 South Hill 98375 South Hill 98447 Parkland 98444 Parkland 98387 Spanaway 98443 Waller 98374 South Hill
Other ZIP codes in Pierce County
98303 98304 98321 98323 98327 98328 98329 98330 98332 98333 98335 98338 98349 98351 98354 98360 98371 98372 98373 98374 98375 98385 98387 98388 All Pierce 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
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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.