Frost dates for ZIP 99008 (Lincoln 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, Harrington, WA (15 miles away).
- Average last spring frostMay 3150% chance of a 32°F freeze after this date
- Average first fall frostSep 1250% chance of a 32°F freeze by this date
- Growing season (frost-free)101 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 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
48°F Below 50°F
24-hour average · latest 52°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Spokane 17 SSW (20 mi), Lind #1 (46 mi).
4-inch depth
49°F Below 50°F
24-hour average · latest 50°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Spokane 17 SSW (20 mi), Lind #1 (46 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 99008 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 49°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically 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) | May 10 |
| 50% (the "average" last frost) | May 31 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 28 |
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) | Aug 23 |
| 50% (the "average" first frost) | Sep 12 |
| 90% (late: most years have frozen by now) | Oct 2 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | May 31 | Sep 12 |
| 28°F (hard freeze) | May 9 | Oct 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 99008
Dates count from your average last spring frost (May 31) and first fall frost (Sep 12). 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 | Apr 5–19 | Jun 7–21 (transplant) | – |
| Pepper (sweet and hot) | Mar 22–Apr 5 | Jun 14–28 (transplant) | – |
| Eggplant | Mar 22–Apr 5 | Jun 14–28 (transplant) | – |
| Tomatillo | Apr 5–19 | Jun 7–21 (transplant) | – |
| Lettuce | Apr 5–19 | May 10–31 (transplant) May 3–Jun 14 (sow outdoors) | Jul 18–Aug 8 (transplant) Jul 4–Aug 1 (sowing) |
| Spinach | – | Apr 19–May 10 (sow outdoors) | Jul 18–Aug 8 (sowing) |
| Kale | Apr 5–19 | May 3–17 (transplant) May 3–17 (sow outdoors) | Jun 20–Jul 18 (transplant) Jun 6–Jul 4 (sowing) |
| Collards | Apr 5–19 | May 3–31 (transplant) May 3–31 (sow outdoors) | Jun 20–Jul 18 (transplant) Jun 6–Jul 4 (sowing) |
| Broccoli | Mar 22–Apr 5 | May 3–17 (transplant) | Jun 6–Jul 4 (transplant) |
| Cabbage | Mar 22–Apr 5 | May 3–17 (transplant) | Jun 6–Jul 4 (transplant) |
| Cauliflower | Mar 22–Apr 5 | May 17–31 (transplant) | Jun 6–Jul 4 (transplant) |
| Brussels sprouts | Mar 8–22 | May 3–17 (transplant) | May 23–Jun 13 (transplant) |
| Kohlrabi | Apr 5–19 | May 3–17 (transplant) May 3–17 (sow outdoors) | Jul 4–18 (sowing) |
| Bok choy / Asian greens | – | May 3–17 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Arugula | – | May 3–31 (sow outdoors) | Jul 18–Aug 15 (sowing) |
| Mustard greens | – | May 3–24 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Swiss chard | Apr 19–May 3 | May 17–Jun 7 (transplant) May 17–Jun 14 (sow outdoors) | Jul 4–18 (sowing) |
| Beet | – | May 3–31 (sow outdoors) | Jul 4–18 (sowing) |
| Carrot | – | May 10–Jun 7 (sow outdoors) | Jun 20–Jul 4 (sowing) |
| Radish | – | Apr 26–Jun 7 (sow outdoors) | Aug 1–15 (sowing) |
| Turnip | – | May 3–24 (sow outdoors) | Jul 4–18 (sowing) |
| Parsnip | – | May 10–31 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 5–May 3 (sow outdoors) | Jun 20–Jul 4 (sowing) |
| Onion (bulbing) | Mar 8–22 | Apr 19–May 3 (transplant) | – |
| Green onion / scallion | – | Apr 19–May 17 (sow outdoors) | Jul 4–18 (sowing) |
| Leek | Mar 8–22 | May 3–17 (transplant) | – |
| Garlic | – | – | Aug 1–29 (sowing) |
| Shallot | – | Apr 19–May 3 (transplant) | Aug 1–29 (sowing) |
| Potato | – | May 3–17 (transplant) | May 23–Jun 6 (transplant) |
| Sweet potato | – | Jun 21–Jul 5 (transplant) | – |
| Sweet corn | – | Jun 7–21 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 7–21 (sow outdoors) | – |
| Bean, pole | – | Jun 7–21 (sow outdoors) | – |
| Lima bean | – | Jun 14–28 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 21–Jul 12 (sow outdoors) | – |
| Cucumber | May 3–10 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Summer squash / zucchini | May 3–10 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Winter squash | May 3–10 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Pumpkin | – | Jun 7–21 (sow outdoors) | – |
| Watermelon | May 3–10 | Jun 14–28 (transplant) Jun 14–28 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 3–10 | Jun 14–28 (transplant) Jun 14–28 (sow outdoors) | – |
| Okra | Apr 19–May 3 | Jun 14–28 (transplant) Jun 14–28 (sow outdoors) | – |
| Celery | Mar 8–22 | Jun 7–14 (transplant) | – |
| Basil | Apr 19–May 3 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Cilantro | – | May 17–Jun 14 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Parsley | Mar 22–Apr 5 | May 17–31 (transplant) May 10–31 (sow outdoors) | – |
| Dill | – | May 31–Jun 14 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Sunflower | – | May 31–Jun 14 (sow outdoors) | – |
| Asparagus (crowns) | – | May 3–17 (transplant) | – |
| Rhubarb (crowns) | – | May 3–17 (transplant) | – |
| Strawberry (plants) | – | May 3–17 (transplant) | Jul 4–Aug 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: Harrington, WA (NOAA GHCN-Daily ID USC00453515), elevation 2,159 ft, 14.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Davenport, WA | 15 mi | Jun 6 | Sep 11 |
| Spokane WFO, WA | 19 mi | May 10 | Sep 26 |
| Spokane 17 SSW, WA | 20 mi | May 30 | Sep 4 |
The average last-frost dates of these stations span 27 days, a rough guide to local variation. See data sources & methods.
Frost questions for 99008
When is the last frost in 99008?
The average (50% chance) last spring freeze of 32°F for ZIP 99008 is May 31. For a more cautious planting date, use June 28, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99008?
The average first fall freeze is September 12. In 1 year in 10 it comes by August 23.
What hardiness zone is 99008?
ZIP 99008 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 99008 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
99022 Medical Lake 99032 Sprague 99029 Reardan 99011 Fairchild AFB 99014 Four Lakes 99004 Cheney 99134 Harrington 99122 Davenport
Other ZIP codes in Lincoln County
99029 99032 99103 99117 99122 99134 99144 99147 99154 99159 99185 All Lincoln County frost dates · Washington frost dates
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