Fall in zone 9aPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 97030 (Gresham, 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, Portland Troutdale AP, OR (3 miles away).
- Average last spring frostMar 1650% chance of a 32°F freeze after this date
- Average first fall frostNov 2050% chance of a 32°F freeze by this date
- Growing season (frost-free)250 daysmedian, 32°F threshold
- USDA hardiness zone9a20 to 25°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 97030 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
- Arugula: fall sowing Sep 25–Oct 23
- Radish: fall sowing Oct 9–23
- Garlic: fall sowing Oct 9–Nov 6
- Shallot: fall sowing Oct 9–Nov 6
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 20: 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) | Feb 18 |
| 50% (the "average" last frost) | Mar 16 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 12 |
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 30 |
| 50% (the "average" first frost) | Nov 20 |
| 90% (late: most years have frozen by now) | Dec 17 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 19 | Oct 30 |
| 32°F (freeze) | Mar 16 | Nov 20 |
| 28°F (hard freeze) | Feb 14 | Dec 15 |
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 97030
Dates count from your average last spring frost (Mar 16) and first fall frost (Nov 20). 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 | Jan 19–Feb 2 | Mar 23–Apr 6 (transplant) | Jul 24–Aug 21 (transplant) |
| Pepper (sweet and hot) | Jan 5–19 | Mar 30–Apr 13 (transplant) | Jul 31–Aug 21 (transplant) |
| Eggplant | Jan 5–19 | Mar 30–Apr 13 (transplant) | Jul 31–Aug 21 (transplant) |
| Tomatillo | Jan 19–Feb 2 | Mar 23–Apr 6 (transplant) | – |
| Lettuce | Jan 19–Feb 2 | Feb 23–Mar 16 (transplant) Feb 16–Mar 30 (sow outdoors) | Sep 25–Oct 16 (transplant) Sep 11–Oct 9 (sowing) |
| Spinach | – | Feb 2–23 (sow outdoors) | Sep 25–Oct 16 (sowing) |
| Kale | Jan 19–Feb 2 | Feb 16–Mar 2 (transplant) Feb 16–Mar 2 (sow outdoors) | Aug 28–Sep 25 (transplant) Aug 14–Sep 11 (sowing) |
| Collards | Jan 19–Feb 2 | Feb 16–Mar 16 (transplant) Feb 16–Mar 16 (sow outdoors) | Aug 28–Sep 25 (transplant) Aug 14–Sep 11 (sowing) |
| Broccoli | Jan 5–19 | Feb 16–Mar 2 (transplant) | Aug 14–Sep 11 (transplant) |
| Cabbage | Jan 5–19 | Feb 16–Mar 2 (transplant) | Aug 14–Sep 11 (transplant) |
| Cauliflower | Jan 5–19 | Mar 2–16 (transplant) | Aug 14–Sep 11 (transplant) |
| Brussels sprouts | Dec 22–Jan 5 | Feb 16–Mar 2 (transplant) | Jul 31–Aug 21 (transplant) |
| Kohlrabi | Jan 19–Feb 2 | Feb 16–Mar 2 (transplant) Feb 16–Mar 2 (sow outdoors) | Sep 11–25 (sowing) |
| Bok choy / Asian greens | – | Feb 16–Mar 2 (sow outdoors) | Sep 25–Oct 9 (sowing) |
| Arugula | – | Feb 16–Mar 16 (sow outdoors) | Sep 25–Oct 23 (sowing) |
| Mustard greens | – | Feb 16–Mar 9 (sow outdoors) | Sep 25–Oct 9 (sowing) |
| Swiss chard | Feb 2–16 | Mar 2–23 (transplant) Mar 2–30 (sow outdoors) | Sep 11–25 (sowing) |
| Beet | – | Feb 16–Mar 16 (sow outdoors) | Sep 11–25 (sowing) |
| Carrot | – | Feb 23–Mar 23 (sow outdoors) | Aug 28–Sep 11 (sowing) |
| Radish | – | Feb 9–Mar 23 (sow outdoors) | Oct 9–23 (sowing) |
| Turnip | – | Feb 16–Mar 9 (sow outdoors) | Sep 11–25 (sowing) |
| Parsnip | – | Feb 23–Mar 16 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Jan 19–Feb 16 (sow outdoors) | Aug 28–Sep 11 (sowing) |
| Onion (bulbing) | Dec 22–Jan 5 | Feb 2–16 (transplant) | – |
| Green onion / scallion | – | Feb 2–Mar 2 (sow outdoors) | Sep 11–25 (sowing) |
| Leek | Dec 22–Jan 5 | Feb 16–Mar 2 (transplant) | – |
| Garlic | – | – | Oct 9–Nov 6 (sowing) |
| Shallot | – | Feb 2–16 (transplant) | Oct 9–Nov 6 (sowing) |
| Potato | – | Feb 16–Mar 2 (transplant) | Jul 31–Aug 14 (transplant) |
| Sweet potato | – | Apr 6–20 (transplant) | – |
| Sweet corn | – | Mar 23–Apr 6 (sow outdoors) | – |
| Bean, bush (snap) | – | Mar 23–Apr 6 (sow outdoors) | Aug 28–Sep 11 (sowing) |
| Bean, pole | – | Mar 23–Apr 6 (sow outdoors) | – |
| Lima bean | – | Mar 30–Apr 13 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 6–27 (sow outdoors) | – |
| Cucumber | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | Aug 28–Sep 11 (sowing) |
| Summer squash / zucchini | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | Aug 28–Sep 11 (sowing) |
| Winter squash | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | – |
| Pumpkin | – | Mar 23–Apr 6 (sow outdoors) | – |
| Watermelon | Feb 16–23 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Cantaloupe / muskmelon | Feb 16–23 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Okra | Feb 2–16 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Celery | Dec 22–Jan 5 | Mar 23–30 (transplant) | – |
| Basil | Feb 2–16 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | – |
| Cilantro | – | Mar 2–30 (sow outdoors) | Sep 25–Oct 9 (sowing) |
| Parsley | Jan 5–19 | Mar 2–16 (transplant) Feb 23–Mar 16 (sow outdoors) | – |
| Dill | – | Mar 16–30 (sow outdoors) | Sep 25–Oct 9 (sowing) |
| Sunflower | – | Mar 16–30 (sow outdoors) | – |
| Asparagus (crowns) | – | Feb 16–Mar 2 (transplant) | – |
| Rhubarb (crowns) | – | Feb 16–Mar 2 (transplant) | – |
| Strawberry (plants) | – | Feb 16–Mar 2 (transplant) | Sep 11–Oct 9 (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: Portland Troutdale AP, OR (NOAA GHCN-Daily ID USW00024242), elevation 29 ft, 3.1 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Troutdale, OR | 4 mi | Mar 26 | Nov 17 |
| Portland WFO, OR | 6 mi | Mar 13 | Nov 22 |
| Portland Intl AP, OR | 10 mi | Mar 13 | Nov 19 |
The average last-frost dates of these stations span 13 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97030
When is the last frost in 97030?
The average (50% chance) last spring freeze of 32°F for ZIP 97030 is March 16. For a more cautious planting date, use April 12, when only 1 year in 10 still sees a later freeze.
When is the first frost in 97030?
The average first fall freeze is November 20. In 1 year in 10 it comes by October 30.
What hardiness zone is 97030?
ZIP 97030 is in USDA zone 9a (20 to 25°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 97030 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
97024 Fairview 97080 Gresham 97233 Portland 97060 Troutdale 97236 Portland 97230 Portland 97089 Damascus 97216 Portland
Other ZIP codes in Multnomah County
97019 97024 97060 97080 97201 97202 97203 97204 97205 97206 97208 97209 97210 97211 97212 97213 97214 97215 97216 97217 97218 97219 97220 97221 All Multnomah 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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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.