Fall in zone 9aPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 97420 (Coos Bay, 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, North Bend Rgnl AP, OR (8 miles away).
- Average last spring frostFeb 2150% chance of a 32°F freeze after this date
- Average first fall frostDec 950% chance of a 32°F freeze by this date
- Growing season (frost-free)294 daysmedian, 32°F threshold
- USDA hardiness zone9a20 to 25°F avg. coldest night
Get The Dial for 97420 (Coos Bay)
Frost and freeze alerts from the NWS forecast for 97420, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
- Freeze alerts
- Soil-temp heads-up
- 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.
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
53°F 50–55°F
24-hour average · latest 54°F, as of Oct 18, 1:00 AM CDT
Measured at NOAA USCRN station Coos Bay 8 SW, 12 mi away. Daily averages: Thu 51°, Fri 51°, Sat 53°.
4-inch depth
54°F 50–55°F
24-hour average · latest 54°F, as of Oct 18, 1:00 AM CDT
Measured at NOAA USCRN station Coos Bay 8 SW, 12 mi away. Daily averages: Thu 53°, Fri 53°, Sat 54°.
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 97420 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 54°F at 4 inches. Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically 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
- Lettuce: fall sowing Sep 30–Oct 28
- Lettuce: fall transplant Oct 14–Nov 4
- Spinach: fall sowing Oct 14–Nov 4
- Bok choy / Asian greens: fall sowing Oct 14–28
- Arugula: fall sowing Oct 14–Nov 11
- Mustard greens: fall sowing Oct 14–28
- Cilantro: fall sowing Oct 14–28
- Dill: fall sowing Oct 14–28
- Strawberry (plants): fall transplant Sep 30–Oct 28
Coming up in the next 3 weeks
- Radish: fall sowing Oct 28–Nov 11
- Garlic: fall sowing Oct 28–Nov 25
- Shallot: fall sowing Oct 28–Nov 25
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Dec 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) | Dec 31 (prior Dec) |
| 50% (the "average" last frost) | Feb 21 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 25 |
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) | Nov 12 |
| 50% (the "average" first frost) | Dec 9 |
| 90% (late: most years have frozen by now) | Jan 28 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 2 | Nov 15 |
| 32°F (freeze) | Feb 21 | Dec 9 |
| 28°F (hard freeze) | Jan 4 | Dec 22 |
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 97420
Dates count from your average last spring frost (Feb 21) and first fall frost (Dec 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 | Dec 27–Jan 10 | Feb 28–Mar 14 (transplant) | Aug 12–Sep 9 (transplant) |
| Pepper (sweet and hot) | Dec 13–27 | Mar 7–21 (transplant) | Aug 19–Sep 9 (transplant) |
| Eggplant | Dec 13–27 | Mar 7–21 (transplant) | Aug 19–Sep 9 (transplant) |
| Tomatillo | Dec 27–Jan 10 | Feb 28–Mar 14 (transplant) | – |
| Lettuce | Dec 27–Jan 10 | Jan 31–Feb 21 (transplant) Jan 24–Mar 7 (sow outdoors) | Oct 14–Nov 4 (transplant) Sep 30–Oct 28 (sowing) |
| Spinach | – | Jan 10–31 (sow outdoors) | Oct 14–Nov 4 (sowing) |
| Kale | Dec 27–Jan 10 | Jan 24–Feb 7 (transplant) Jan 24–Feb 7 (sow outdoors) | Sep 16–Oct 14 (transplant) Sep 2–30 (sowing) |
| Collards | Dec 27–Jan 10 | Jan 24–Feb 21 (transplant) Jan 24–Feb 21 (sow outdoors) | Sep 16–Oct 14 (transplant) Sep 2–30 (sowing) |
| Broccoli | Dec 13–27 | Jan 24–Feb 7 (transplant) | Sep 2–30 (transplant) |
| Cabbage | Dec 13–27 | Jan 24–Feb 7 (transplant) | Sep 2–30 (transplant) |
| Cauliflower | Dec 13–27 | Feb 7–21 (transplant) | Sep 2–30 (transplant) |
| Brussels sprouts | Nov 29–Dec 13 | Jan 24–Feb 7 (transplant) | Aug 19–Sep 9 (transplant) |
| Kohlrabi | Dec 27–Jan 10 | Jan 24–Feb 7 (transplant) Jan 24–Feb 7 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Bok choy / Asian greens | – | Jan 24–Feb 7 (sow outdoors) | Oct 14–28 (sowing) |
| Arugula | – | Jan 24–Feb 21 (sow outdoors) | Oct 14–Nov 11 (sowing) |
| Mustard greens | – | Jan 24–Feb 14 (sow outdoors) | Oct 14–28 (sowing) |
| Swiss chard | Jan 10–24 | Feb 7–28 (transplant) Feb 7–Mar 7 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Beet | – | Jan 24–Feb 21 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Carrot | – | Jan 31–Feb 28 (sow outdoors) | Sep 16–30 (sowing) |
| Radish | – | Jan 17–Feb 28 (sow outdoors) | Oct 28–Nov 11 (sowing) |
| Turnip | – | Jan 24–Feb 14 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Parsnip | – | Jan 31–Feb 21 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 27–Jan 24 (sow outdoors) | Sep 16–30 (sowing) |
| Onion (bulbing) | Nov 29–Dec 13 | Jan 10–24 (transplant) | – |
| Green onion / scallion | – | Jan 10–Feb 7 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Leek | Nov 29–Dec 13 | Jan 24–Feb 7 (transplant) | – |
| Garlic | – | – | Oct 28–Nov 25 (sowing) |
| Shallot | – | Jan 10–24 (transplant) | Oct 28–Nov 25 (sowing) |
| Potato | – | Jan 24–Feb 7 (transplant) | Aug 19–Sep 2 (transplant) |
| Sweet potato | – | Mar 14–28 (transplant) | – |
| Sweet corn | – | Feb 28–Mar 14 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 28–Mar 14 (sow outdoors) | Sep 16–30 (sowing) |
| Bean, pole | – | Feb 28–Mar 14 (sow outdoors) | – |
| Lima bean | – | Mar 7–21 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Mar 14–Apr 4 (sow outdoors) | – |
| Cucumber | Jan 24–31 | Feb 28–Mar 14 (transplant) Feb 28–Mar 14 (sow outdoors) | Sep 16–30 (sowing) |
| Summer squash / zucchini | Jan 24–31 | Feb 28–Mar 14 (transplant) Feb 28–Mar 14 (sow outdoors) | Sep 16–30 (sowing) |
| Winter squash | Jan 24–31 | Feb 28–Mar 14 (transplant) Feb 28–Mar 14 (sow outdoors) | – |
| Pumpkin | – | Feb 28–Mar 14 (sow outdoors) | – |
| Watermelon | Jan 24–31 | Mar 7–21 (transplant) Mar 7–21 (sow outdoors) | – |
| Cantaloupe / muskmelon | Jan 24–31 | Mar 7–21 (transplant) Mar 7–21 (sow outdoors) | – |
| Okra | Jan 10–24 | Mar 7–21 (transplant) Mar 7–21 (sow outdoors) | – |
| Celery | Nov 29–Dec 13 | Feb 28–Mar 7 (transplant) | – |
| Basil | Jan 10–24 | Feb 28–Mar 14 (transplant) Feb 28–Mar 14 (sow outdoors) | – |
| Cilantro | – | Feb 7–Mar 7 (sow outdoors) | Oct 14–28 (sowing) |
| Parsley | Dec 13–27 | Feb 7–21 (transplant) Jan 31–Feb 21 (sow outdoors) | – |
| Dill | – | Feb 21–Mar 7 (sow outdoors) | Oct 14–28 (sowing) |
| Sunflower | – | Feb 21–Mar 7 (sow outdoors) | – |
| Asparagus (crowns) | – | Jan 24–Feb 7 (transplant) | – |
| Rhubarb (crowns) | – | Jan 24–Feb 7 (transplant) | – |
| Strawberry (plants) | – | Jan 24–Feb 7 (transplant) | Sep 30–Oct 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: North Bend Rgnl AP, OR (NOAA GHCN-Daily ID USW00024284), elevation 17 ft, 8.3 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Coos Bay 8 SW, OR | 12 mi | Apr 15 | Oct 31 |
| Coquille City, OR | 12 mi | Mar 28 | Nov 6 |
| Bandon 2 NNE, OR | 20 mi | Mar 9 | Nov 27 |
The average last-frost dates of these stations span 56 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97420
When is the last frost in 97420?
The average (50% chance) last spring freeze of 32°F for ZIP 97420 is February 21. For a more cautious planting date, use March 25, when only 1 year in 10 still sees a later freeze.
When is the first frost in 97420?
The average first fall freeze is December 9. In 1 year in 10 it comes by November 12.
What hardiness zone is 97420?
ZIP 97420 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 97420 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
97459 North Bend 97423 Coquille 97449 Lakeside 97458 Myrtle Point 97411 Bandon 97473 97414 97441 Gardiner
Other ZIP codes in Coos County
97411 97414 97423 97449 97458 97459 97466 All Coos County frost dates · Oregon frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- 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.