Frost dates for ZIP 97361 (Monmouth, 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, Falls City 2 SSW, OR (7 miles away).
- Average last spring frostApr 1850% chance of a 32°F freeze after this date
- Average first fall frostNov 750% chance of a 32°F freeze by this date
- Growing season (frost-free)202 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°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
58°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Corvallis 10 SSW (25 mi).
4-inch depth
58°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Corvallis 10 SSW (25 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 97361 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: 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
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 7: 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) | Mar 27 |
| 50% (the "average" last frost) | Apr 18 |
| 10% (cautious: only 1 year in 10 freezes later) | May 6 |
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 21 |
| 50% (the "average" first frost) | Nov 7 |
| 90% (late: most years have frozen by now) | Nov 24 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 9 | Oct 21 |
| 32°F (freeze) | Apr 18 | Nov 7 |
| 28°F (hard freeze) | Mar 13 | Nov 23 |
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 97361
Dates count from your average last spring frost (Apr 18) and first fall frost (Nov 7). 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 21–Mar 7 | Apr 25–May 9 (transplant) | – |
| Pepper (sweet and hot) | Feb 7–21 | May 2–16 (transplant) | – |
| Eggplant | Feb 7–21 | May 2–16 (transplant) | – |
| Tomatillo | Feb 21–Mar 7 | Apr 25–May 9 (transplant) | – |
| Lettuce | Feb 21–Mar 7 | Mar 28–Apr 18 (transplant) Mar 21–May 2 (sow outdoors) | Sep 12–Oct 3 (transplant) Aug 29–Sep 26 (sowing) |
| Spinach | – | Mar 7–28 (sow outdoors) | Sep 12–Oct 3 (sowing) |
| Kale | Feb 21–Mar 7 | Mar 21–Apr 4 (transplant) Mar 21–Apr 4 (sow outdoors) | Aug 15–Sep 12 (transplant) Aug 1–29 (sowing) |
| Collards | Feb 21–Mar 7 | Mar 21–Apr 18 (transplant) Mar 21–Apr 18 (sow outdoors) | Aug 15–Sep 12 (transplant) Aug 1–29 (sowing) |
| Broccoli | Feb 7–21 | Mar 21–Apr 4 (transplant) | Aug 1–29 (transplant) |
| Cabbage | Feb 7–21 | Mar 21–Apr 4 (transplant) | Aug 1–29 (transplant) |
| Cauliflower | Feb 7–21 | Apr 4–18 (transplant) | Aug 1–29 (transplant) |
| Brussels sprouts | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) | Jul 18–Aug 8 (transplant) |
| Kohlrabi | Feb 21–Mar 7 | Mar 21–Apr 4 (transplant) Mar 21–Apr 4 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Bok choy / Asian greens | – | Mar 21–Apr 4 (sow outdoors) | Sep 12–26 (sowing) |
| Arugula | – | Mar 21–Apr 18 (sow outdoors) | Sep 12–Oct 10 (sowing) |
| Mustard greens | – | Mar 21–Apr 11 (sow outdoors) | Sep 12–26 (sowing) |
| Swiss chard | Mar 7–21 | Apr 4–25 (transplant) Apr 4–May 2 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Beet | – | Mar 21–Apr 18 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Carrot | – | Mar 28–Apr 25 (sow outdoors) | Aug 15–29 (sowing) |
| Radish | – | Mar 14–Apr 25 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Turnip | – | Mar 21–Apr 11 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Parsnip | – | Mar 28–Apr 18 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 21–Mar 21 (sow outdoors) | Aug 15–29 (sowing) |
| Onion (bulbing) | Jan 24–Feb 7 | Mar 7–21 (transplant) | – |
| Green onion / scallion | – | Mar 7–Apr 4 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Leek | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) | – |
| Garlic | – | – | Sep 26–Oct 24 (sowing) |
| Shallot | – | Mar 7–21 (transplant) | Sep 26–Oct 24 (sowing) |
| Potato | – | Mar 21–Apr 4 (transplant) | Jul 18–Aug 1 (transplant) |
| Sweet potato | – | May 9–23 (transplant) | – |
| Sweet corn | – | Apr 25–May 9 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 25–May 9 (sow outdoors) | – |
| Bean, pole | – | Apr 25–May 9 (sow outdoors) | – |
| Lima bean | – | May 2–16 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 9–30 (sow outdoors) | – |
| Cucumber | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Summer squash / zucchini | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Winter squash | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Pumpkin | – | Apr 25–May 9 (sow outdoors) | – |
| Watermelon | Mar 21–28 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 21–28 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Okra | Mar 7–21 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Celery | Jan 24–Feb 7 | Apr 25–May 2 (transplant) | – |
| Basil | Mar 7–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Cilantro | – | Apr 4–May 2 (sow outdoors) | Sep 12–26 (sowing) |
| Parsley | Feb 7–21 | Apr 4–18 (transplant) Mar 28–Apr 18 (sow outdoors) | – |
| Dill | – | Apr 18–May 2 (sow outdoors) | Sep 12–26 (sowing) |
| Sunflower | – | Apr 18–May 2 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 21–Apr 4 (transplant) | – |
| Rhubarb (crowns) | – | Mar 21–Apr 4 (transplant) | – |
| Strawberry (plants) | – | Mar 21–Apr 4 (transplant) | Aug 29–Sep 26 (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: Falls City 2 SSW, OR (NOAA GHCN-Daily ID USC00352800), elevation 690 ft, 7.3 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Dallas 2 NE, OR | 12 mi | Apr 16 | Nov 1 |
| Corvallis State Univ, OR | 12 mi | Apr 17 | Oct 28 |
| Laurel Mtn, OR | 16 mi | May 20 | Oct 23 |
The average last-frost dates of these stations span 35 days, a rough guide to local variation. See data sources & methods.
Frost questions for 97361
When is the last frost in 97361?
The average (50% chance) last spring freeze of 32°F for ZIP 97361 is April 18. For a more cautious planting date, use May 6, when only 1 year in 10 still sees a later freeze.
When is the first frost in 97361?
The average first fall freeze is November 7. In 1 year in 10 it comes by October 21.
What hardiness zone is 97361?
ZIP 97361 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 97361 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
97344 Falls City 97330 Corvallis 97351 Independence 97338 Dallas 97306 Salem 97321 Albany 97352 Jefferson 97331 Corvallis
Other ZIP codes in Polk County
97304 97338 97344 97351 97371 All Polk County frost dates · Oregon frost dates
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