Fall in zone 6bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 97902 (Malheur County, OR)
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, Rome 2 NW, OR (9 miles away).
- Average last spring frostJun 1150% chance of a 32°F freeze after this date
- Average first fall frostSep 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)88 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
58°F 55°F or warmer
24-hour average · latest 57°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Jordan Valley Cwma (25 mi), Murphy 10 W (42 mi).
4-inch depth
58°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Jordan Valley Cwma (25 mi), Murphy 10 W (42 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 97902 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 58°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
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 20 |
| 50% (the "average" last frost) | Jun 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Jul 3 |
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 27 |
| 50% (the "average" first frost) | Sep 10 |
| 90% (late: most years have frozen by now) | Sep 24 |
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) | Jun 11 | Sep 10 |
| 28°F (hard freeze) | May 22 | Sep 21 |
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 97902
Dates count from your average last spring frost (Jun 11) and first fall frost (Sep 10). 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 16–30 | Jun 18–Jul 2 (transplant) | – |
| Pepper (sweet and hot) | Apr 2–16 | Jun 25–Jul 9 (transplant) | – |
| Eggplant | Apr 2–16 | Jun 25–Jul 9 (transplant) | – |
| Tomatillo | Apr 16–30 | Jun 18–Jul 2 (transplant) | – |
| Lettuce | Apr 16–30 | May 21–Jun 11 (transplant) May 14–Jun 25 (sow outdoors) | Jul 16–Aug 6 (transplant) Jul 2–30 (sowing) |
| Spinach | – | Apr 30–May 21 (sow outdoors) | Jul 16–Aug 6 (sowing) |
| Kale | Apr 16–30 | May 14–28 (transplant) May 14–28 (sow outdoors) | Jun 18–Jul 16 (transplant) Jun 4–Jul 2 (sowing) |
| Collards | Apr 16–30 | May 14–Jun 11 (transplant) May 14–Jun 11 (sow outdoors) | Jun 18–Jul 16 (transplant) |
| Broccoli | Apr 2–16 | May 14–28 (transplant) | Jun 4–Jul 2 (transplant) |
| Cabbage | Apr 2–16 | May 14–28 (transplant) | Jun 4–Jul 2 (transplant) |
| Cauliflower | Apr 2–16 | May 28–Jun 11 (transplant) | – |
| Brussels sprouts | Mar 19–Apr 2 | May 14–28 (transplant) | – |
| Kohlrabi | Apr 16–30 | May 14–28 (transplant) May 14–28 (sow outdoors) | Jul 2–16 (sowing) |
| Bok choy / Asian greens | – | May 14–28 (sow outdoors) | Jul 16–30 (sowing) |
| Arugula | – | May 14–Jun 11 (sow outdoors) | Jul 16–Aug 13 (sowing) |
| Mustard greens | – | May 14–Jun 4 (sow outdoors) | Jul 16–30 (sowing) |
| Swiss chard | Apr 30–May 14 | May 28–Jun 18 (transplant) May 28–Jun 25 (sow outdoors) | Jul 2–16 (sowing) |
| Beet | – | May 14–Jun 11 (sow outdoors) | Jul 2–16 (sowing) |
| Carrot | – | May 21–Jun 18 (sow outdoors) | – |
| Radish | – | May 7–Jun 18 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Turnip | – | May 14–Jun 4 (sow outdoors) | Jul 2–16 (sowing) |
| Parsnip | – | May 21–Jun 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 16–May 14 (sow outdoors) | Jun 18–Jul 2 (sowing) |
| Onion (bulbing) | Mar 19–Apr 2 | Apr 30–May 14 (transplant) | – |
| Green onion / scallion | – | Apr 30–May 28 (sow outdoors) | Jul 2–16 (sowing) |
| Leek | Mar 19–Apr 2 | May 14–28 (transplant) | – |
| Garlic | – | – | Jul 30–Aug 27 (sowing) |
| Shallot | – | Apr 30–May 14 (transplant) | Jul 30–Aug 27 (sowing) |
| Potato | – | May 14–28 (transplant) | – |
| Sweet potato | – | Jul 2–16 (transplant) | – |
| Sweet corn | – | Jun 18–Jul 2 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 18–Jul 2 (sow outdoors) | – |
| Bean, pole | – | Jun 18–Jul 2 (sow outdoors) | – |
| Lima bean | – | Jun 25–Jul 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jul 2–23 (sow outdoors) | – |
| Cucumber | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Summer squash / zucchini | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Winter squash | May 14–21 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Pumpkin | – | Jun 18–Jul 2 (sow outdoors) | – |
| Watermelon | May 14–21 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 14–21 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Okra | Apr 30–May 14 | Jun 25–Jul 9 (transplant) Jun 25–Jul 9 (sow outdoors) | – |
| Celery | Mar 19–Apr 2 | Jun 18–25 (transplant) | – |
| Basil | Apr 30–May 14 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Cilantro | – | May 28–Jun 25 (sow outdoors) | Jul 16–30 (sowing) |
| Parsley | Apr 2–16 | May 28–Jun 11 (transplant) May 21–Jun 11 (sow outdoors) | – |
| Dill | – | Jun 11–25 (sow outdoors) | Jul 16–30 (sowing) |
| Sunflower | – | Jun 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | May 14–28 (transplant) | – |
| Rhubarb (crowns) | – | May 14–28 (transplant) | – |
| Strawberry (plants) | – | May 14–28 (transplant) | Jul 2–30 (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: Rome 2 NW, OR (NOAA GHCN-Daily ID USC00357310), elevation 3,405 ft, 9.1 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Sheaville 1 SE, OR | 27 mi | May 22 | Sep 28 |
| Rome St AP, OR | 29 mi | May 26 | Sep 21 |
| Silver City 5 W, ID | 34 mi | May 31 | Oct 6 |
The average last-frost dates of these stations span 20 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97902
When is the last frost in 97902?
The average (50% chance) last spring freeze of 32°F for ZIP 97902 is June 11. For a more cautious planting date, use July 3, when only 1 year in 10 still sees a later freeze.
When is the first frost in 97902?
The average first fall freeze is September 10. In 1 year in 10 it comes by August 27.
What hardiness zone is 97902?
ZIP 97902 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 97902 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
97910 Jordan Valley 97906 Harper 83650 Murphy 83639 Marsing 97901 Adrian 97913 Nyssa 83641 Melba 83628 Homedale
Other ZIP codes in Malheur County
89421 97901 97903 97906 97908 97909 97910 97911 97913 97914 97917 97918 97920 All Malheur County frost dates · Oregon 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.