Fall in zone 7aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 97914 (Ontario, 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, Ontario Muni AP, OR (7 miles away).
- Average last spring frostApr 2150% chance of a 32°F freeze after this date
- Average first fall frostOct 1450% chance of a 32°F freeze by this date
- Growing season (frost-free)176 daysmedian, 32°F threshold
- USDA hardiness zone7a0 to 5°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 97914 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 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) | Apr 4 |
| 50% (the "average" last frost) | Apr 21 |
| 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) | Sep 29 |
| 50% (the "average" first frost) | Oct 14 |
| 90% (late: most years have frozen by now) | Oct 29 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 4 | Oct 1 |
| 32°F (freeze) | Apr 21 | Oct 14 |
| 28°F (hard freeze) | Apr 2 | Oct 27 |
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 97914
Dates count from your average last spring frost (Apr 21) and first fall frost (Oct 14). 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 24–Mar 10 | Apr 28–May 12 (transplant) | – |
| Pepper (sweet and hot) | Feb 10–24 | May 5–19 (transplant) | – |
| Eggplant | Feb 10–24 | May 5–19 (transplant) | – |
| Tomatillo | Feb 24–Mar 10 | Apr 28–May 12 (transplant) | – |
| Lettuce | Feb 24–Mar 10 | Mar 31–Apr 21 (transplant) Mar 24–May 5 (sow outdoors) | Aug 19–Sep 9 (transplant) Aug 5–Sep 2 (sowing) |
| Spinach | – | Mar 10–31 (sow outdoors) | Aug 19–Sep 9 (sowing) |
| Kale | Feb 24–Mar 10 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | Jul 22–Aug 19 (transplant) Jul 8–Aug 5 (sowing) |
| Collards | Feb 24–Mar 10 | Mar 24–Apr 21 (transplant) Mar 24–Apr 21 (sow outdoors) | Jul 22–Aug 19 (transplant) Jul 8–Aug 5 (sowing) |
| Broccoli | Feb 10–24 | Mar 24–Apr 7 (transplant) | Jul 8–Aug 5 (transplant) |
| Cabbage | Feb 10–24 | Mar 24–Apr 7 (transplant) | Jul 8–Aug 5 (transplant) |
| Cauliflower | Feb 10–24 | Apr 7–21 (transplant) | Jul 8–Aug 5 (transplant) |
| Brussels sprouts | Jan 27–Feb 10 | Mar 24–Apr 7 (transplant) | Jun 24–Jul 15 (transplant) |
| Kohlrabi | Feb 24–Mar 10 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | Aug 5–19 (sowing) |
| Bok choy / Asian greens | – | Mar 24–Apr 7 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Arugula | – | Mar 24–Apr 21 (sow outdoors) | Aug 19–Sep 16 (sowing) |
| Mustard greens | – | Mar 24–Apr 14 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Swiss chard | Mar 10–24 | Apr 7–28 (transplant) Apr 7–May 5 (sow outdoors) | Aug 5–19 (sowing) |
| Beet | – | Mar 24–Apr 21 (sow outdoors) | Aug 5–19 (sowing) |
| Carrot | – | Mar 31–Apr 28 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Radish | – | Mar 17–Apr 28 (sow outdoors) | Sep 2–16 (sowing) |
| Turnip | – | Mar 24–Apr 14 (sow outdoors) | Aug 5–19 (sowing) |
| Parsnip | – | Mar 31–Apr 21 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 24–Mar 24 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Onion (bulbing) | Jan 27–Feb 10 | Mar 10–24 (transplant) | – |
| Green onion / scallion | – | Mar 10–Apr 7 (sow outdoors) | Aug 5–19 (sowing) |
| Leek | Jan 27–Feb 10 | Mar 24–Apr 7 (transplant) | – |
| Garlic | – | – | Sep 2–30 (sowing) |
| Shallot | – | Mar 10–24 (transplant) | Sep 2–30 (sowing) |
| Potato | – | Mar 24–Apr 7 (transplant) | Jun 24–Jul 8 (transplant) |
| Sweet potato | – | May 12–26 (transplant) | – |
| Sweet corn | – | Apr 28–May 12 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 28–May 12 (sow outdoors) | – |
| Bean, pole | – | Apr 28–May 12 (sow outdoors) | – |
| Lima bean | – | May 5–19 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 12–Jun 2 (sow outdoors) | – |
| Cucumber | Mar 24–31 | Apr 28–May 12 (transplant) Apr 28–May 12 (sow outdoors) | – |
| Summer squash / zucchini | Mar 24–31 | Apr 28–May 12 (transplant) Apr 28–May 12 (sow outdoors) | – |
| Winter squash | Mar 24–31 | Apr 28–May 12 (transplant) Apr 28–May 12 (sow outdoors) | – |
| Pumpkin | – | Apr 28–May 12 (sow outdoors) | – |
| Watermelon | Mar 24–31 | May 5–19 (transplant) May 5–19 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 24–31 | May 5–19 (transplant) May 5–19 (sow outdoors) | – |
| Okra | Mar 10–24 | May 5–19 (transplant) May 5–19 (sow outdoors) | – |
| Celery | Jan 27–Feb 10 | Apr 28–May 5 (transplant) | – |
| Basil | Mar 10–24 | Apr 28–May 12 (transplant) Apr 28–May 12 (sow outdoors) | – |
| Cilantro | – | Apr 7–May 5 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Parsley | Feb 10–24 | Apr 7–21 (transplant) Mar 31–Apr 21 (sow outdoors) | – |
| Dill | – | Apr 21–May 5 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Sunflower | – | Apr 21–May 5 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 24–Apr 7 (transplant) | – |
| Rhubarb (crowns) | – | Mar 24–Apr 7 (transplant) | – |
| Strawberry (plants) | – | Mar 24–Apr 7 (transplant) | Aug 5–Sep 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: Ontario Muni AP, OR (NOAA GHCN-Daily ID USW00024162), elevation 2,190 ft, 7.1 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Ontario Ksrv, OR | 7 mi | Apr 22 | Oct 9 |
| Payette, ID | 8 mi | Apr 19 | Oct 20 |
| Malheur Branch EXP STN, OR | 10 mi | Apr 23 | Oct 13 |
The average last-frost dates of these stations span 4 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97914
When is the last frost in 97914?
The average (50% chance) last spring freeze of 32°F for ZIP 97914 is April 21. 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 97914?
The average first fall freeze is October 14. In 1 year in 10 it comes by September 29.
What hardiness zone is 97914?
ZIP 97914 is in USDA zone 7a (0 to 5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 97914 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
83619 Fruitland 97909 83655 New Plymouth 97918 Vale 83661 Payette 83672 Weiser 83660 Parma 97907 Huntington
Other ZIP codes in Malheur County
89421 97901 97902 97903 97906 97908 97909 97910 97911 97913 97917 97918 97920 All Malheur County frost dates · Oregon frost dates
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- 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.