Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 98661 (Vancouver, 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, Vancouver Pearson AP, WA (2 miles away).
- Average last spring frostMar 2950% chance of a 32°F freeze after this date
- Average first fall frostNov 950% chance of a 32°F freeze by this date
- Growing season (frost-free)223 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 98661 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 9: 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 6 |
| 50% (the "average" last frost) | Mar 29 |
| 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 22 |
| 50% (the "average" first frost) | Nov 9 |
| 90% (late: most years have frozen by now) | Nov 30 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 24 | Oct 24 |
| 32°F (freeze) | Mar 29 | Nov 9 |
| 28°F (hard freeze) | Mar 3 | Nov 26 |
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 98661
Dates count from your average last spring frost (Mar 29) and first fall frost (Nov 9). 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 1–15 | Apr 5–19 (transplant) | Jul 13–Aug 10 (transplant) |
| Pepper (sweet and hot) | Jan 18–Feb 1 | Apr 12–26 (transplant) | Jul 20–Aug 10 (transplant) |
| Eggplant | Jan 18–Feb 1 | Apr 12–26 (transplant) | Jul 20–Aug 10 (transplant) |
| Tomatillo | Feb 1–15 | Apr 5–19 (transplant) | – |
| Lettuce | Feb 1–15 | Mar 8–29 (transplant) Mar 1–Apr 12 (sow outdoors) | Sep 14–Oct 5 (transplant) Aug 31–Sep 28 (sowing) |
| Spinach | – | Feb 15–Mar 8 (sow outdoors) | Sep 14–Oct 5 (sowing) |
| Kale | Feb 1–15 | Mar 1–15 (transplant) Mar 1–15 (sow outdoors) | Aug 17–Sep 14 (transplant) Aug 3–31 (sowing) |
| Collards | Feb 1–15 | Mar 1–29 (transplant) Mar 1–29 (sow outdoors) | Aug 17–Sep 14 (transplant) Aug 3–31 (sowing) |
| Broccoli | Jan 18–Feb 1 | Mar 1–15 (transplant) | Aug 3–31 (transplant) |
| Cabbage | Jan 18–Feb 1 | Mar 1–15 (transplant) | Aug 3–31 (transplant) |
| Cauliflower | Jan 18–Feb 1 | Mar 15–29 (transplant) | Aug 3–31 (transplant) |
| Brussels sprouts | Jan 4–18 | Mar 1–15 (transplant) | Jul 20–Aug 10 (transplant) |
| Kohlrabi | Feb 1–15 | Mar 1–15 (transplant) Mar 1–15 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Bok choy / Asian greens | – | Mar 1–15 (sow outdoors) | Sep 14–28 (sowing) |
| Arugula | – | Mar 1–29 (sow outdoors) | Sep 14–Oct 12 (sowing) |
| Mustard greens | – | Mar 1–22 (sow outdoors) | Sep 14–28 (sowing) |
| Swiss chard | Feb 15–Mar 1 | Mar 15–Apr 5 (transplant) Mar 15–Apr 12 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Beet | – | Mar 1–29 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Carrot | – | Mar 8–Apr 5 (sow outdoors) | Aug 17–31 (sowing) |
| Radish | – | Feb 22–Apr 5 (sow outdoors) | Sep 28–Oct 12 (sowing) |
| Turnip | – | Mar 1–22 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Parsnip | – | Mar 8–29 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 1–Mar 1 (sow outdoors) | Aug 17–31 (sowing) |
| Onion (bulbing) | Jan 4–18 | Feb 15–Mar 1 (transplant) | – |
| Green onion / scallion | – | Feb 15–Mar 15 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Leek | Jan 4–18 | Mar 1–15 (transplant) | – |
| Garlic | – | – | Sep 28–Oct 26 (sowing) |
| Shallot | – | Feb 15–Mar 1 (transplant) | Sep 28–Oct 26 (sowing) |
| Potato | – | Mar 1–15 (transplant) | Jul 20–Aug 3 (transplant) |
| Sweet potato | – | Apr 19–May 3 (transplant) | – |
| Sweet corn | – | Apr 5–19 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 5–19 (sow outdoors) | Aug 17–31 (sowing) |
| Bean, pole | – | Apr 5–19 (sow outdoors) | – |
| Lima bean | – | Apr 12–26 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 19–May 10 (sow outdoors) | – |
| Cucumber | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | Aug 17–31 (sowing) |
| Summer squash / zucchini | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | Aug 17–31 (sowing) |
| Winter squash | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | – |
| Pumpkin | – | Apr 5–19 (sow outdoors) | – |
| Watermelon | Mar 1–8 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 1–8 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Okra | Feb 15–Mar 1 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Celery | Jan 4–18 | Apr 5–12 (transplant) | – |
| Basil | Feb 15–Mar 1 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | – |
| Cilantro | – | Mar 15–Apr 12 (sow outdoors) | Sep 14–28 (sowing) |
| Parsley | Jan 18–Feb 1 | Mar 15–29 (transplant) Mar 8–29 (sow outdoors) | – |
| Dill | – | Mar 29–Apr 12 (sow outdoors) | Sep 14–28 (sowing) |
| Sunflower | – | Mar 29–Apr 12 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 1–15 (transplant) | – |
| Rhubarb (crowns) | – | Mar 1–15 (transplant) | – |
| Strawberry (plants) | – | Mar 1–15 (transplant) | Aug 31–Sep 28 (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: Vancouver Pearson AP, WA (NOAA GHCN-Daily ID USW00094298), elevation 30 ft, 2.1 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Vancouver 4 NNE, WA | 3 mi | Apr 26 | Oct 18 |
| Portland Intl AP, OR | 4 mi | Mar 13 | Nov 19 |
| Portland WFO, OR | 7 mi | Mar 13 | Nov 22 |
The average last-frost dates of these stations span 44 days, a rough guide to local variation. See data sources & methods.
Frost questions for 98661
When is the last frost in 98661?
The average (50% chance) last spring freeze of 32°F for ZIP 98661 is March 29. 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 98661?
The average first fall freeze is November 9. In 1 year in 10 it comes by October 22.
What hardiness zone is 98661?
ZIP 98661 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 98661 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
98663 Vancouver 98664 Vancouver 98665 Hazel Dell 97211 Portland 98662 Five Corners 97217 Portland 97218 Portland 98660 Vancouver
Other ZIP codes in Clark County
98601 98604 98606 98607 98629 98642 98660 98662 98663 98664 98665 98675 98682 98683 98684 98685 98686 All Clark 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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- 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.