Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 16331 (Clarion County, PA)
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, Clarion 3 SW, PA (9 miles away).
- Average last spring frostMay 950% chance of a 32°F freeze after this date
- Average first fall frostOct 1150% chance of a 32°F freeze by this date
- Growing season (frost-free)154 daysmedian, 32°F threshold
- USDA hardiness zone6a-10 to -5°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 16331, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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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 16331 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 early May.
Fertilizer window
Lawn region: North (cool-season). 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 24 |
| 50% (the "average" last frost) | May 9 |
| 10% (cautious: only 1 year in 10 freezes later) | May 24 |
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 30 |
| 50% (the "average" first frost) | Oct 11 |
| 90% (late: most years have frozen by now) | Oct 26 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 20 | Oct 2 |
| 32°F (freeze) | May 9 | Oct 11 |
| 28°F (hard freeze) | Apr 29 | Oct 24 |
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 16331
Dates count from your average last spring frost (May 9) and first fall frost (Oct 11). 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 | Mar 14–28 | May 16–30 (transplant) | – |
| Pepper (sweet and hot) | Feb 28–Mar 14 | May 23–Jun 6 (transplant) | – |
| Eggplant | Feb 28–Mar 14 | May 23–Jun 6 (transplant) | – |
| Tomatillo | Mar 14–28 | May 16–30 (transplant) | – |
| Lettuce | Mar 14–28 | Apr 18–May 9 (transplant) Apr 11–May 23 (sow outdoors) | Aug 16–Sep 6 (transplant) Aug 2–30 (sowing) |
| Spinach | – | Mar 28–Apr 18 (sow outdoors) | Aug 16–Sep 6 (sowing) |
| Kale | Mar 14–28 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | Jul 19–Aug 16 (transplant) Jul 5–Aug 2 (sowing) |
| Collards | Mar 14–28 | Apr 11–May 9 (transplant) Apr 11–May 9 (sow outdoors) | Jul 19–Aug 16 (transplant) Jul 5–Aug 2 (sowing) |
| Broccoli | Feb 28–Mar 14 | Apr 11–25 (transplant) | Jul 5–Aug 2 (transplant) |
| Cabbage | Feb 28–Mar 14 | Apr 11–25 (transplant) | Jul 5–Aug 2 (transplant) |
| Cauliflower | Feb 28–Mar 14 | Apr 25–May 9 (transplant) | Jul 5–Aug 2 (transplant) |
| Brussels sprouts | Feb 14–28 | Apr 11–25 (transplant) | Jun 21–Jul 12 (transplant) |
| Kohlrabi | Mar 14–28 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | Aug 2–16 (sowing) |
| Bok choy / Asian greens | – | Apr 11–25 (sow outdoors) | Aug 16–30 (sowing) |
| Arugula | – | Apr 11–May 9 (sow outdoors) | Aug 16–Sep 13 (sowing) |
| Mustard greens | – | Apr 11–May 2 (sow outdoors) | Aug 16–30 (sowing) |
| Swiss chard | Mar 28–Apr 11 | Apr 25–May 16 (transplant) Apr 25–May 23 (sow outdoors) | Aug 2–16 (sowing) |
| Beet | – | Apr 11–May 9 (sow outdoors) | Aug 2–16 (sowing) |
| Carrot | – | Apr 18–May 16 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Radish | – | Apr 4–May 16 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Turnip | – | Apr 11–May 2 (sow outdoors) | Aug 2–16 (sowing) |
| Parsnip | – | Apr 18–May 9 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 14–Apr 11 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Onion (bulbing) | Feb 14–28 | Mar 28–Apr 11 (transplant) | – |
| Green onion / scallion | – | Mar 28–Apr 25 (sow outdoors) | Aug 2–16 (sowing) |
| Leek | Feb 14–28 | Apr 11–25 (transplant) | – |
| Garlic | – | – | Aug 30–Sep 27 (sowing) |
| Shallot | – | Mar 28–Apr 11 (transplant) | Aug 30–Sep 27 (sowing) |
| Potato | – | Apr 11–25 (transplant) | Jun 21–Jul 5 (transplant) |
| Sweet potato | – | May 30–Jun 13 (transplant) | – |
| Sweet corn | – | May 16–30 (sow outdoors) | – |
| Bean, bush (snap) | – | May 16–30 (sow outdoors) | – |
| Bean, pole | – | May 16–30 (sow outdoors) | – |
| Lima bean | – | May 23–Jun 6 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 30–Jun 20 (sow outdoors) | – |
| Cucumber | Apr 11–18 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Summer squash / zucchini | Apr 11–18 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Winter squash | Apr 11–18 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Pumpkin | – | May 16–30 (sow outdoors) | – |
| Watermelon | Apr 11–18 | May 23–Jun 6 (transplant) May 23–Jun 6 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 11–18 | May 23–Jun 6 (transplant) May 23–Jun 6 (sow outdoors) | – |
| Okra | Mar 28–Apr 11 | May 23–Jun 6 (transplant) May 23–Jun 6 (sow outdoors) | – |
| Celery | Feb 14–28 | May 16–23 (transplant) | – |
| Basil | Mar 28–Apr 11 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Cilantro | – | Apr 25–May 23 (sow outdoors) | Aug 16–30 (sowing) |
| Parsley | Feb 28–Mar 14 | Apr 25–May 9 (transplant) Apr 18–May 9 (sow outdoors) | – |
| Dill | – | May 9–23 (sow outdoors) | Aug 16–30 (sowing) |
| Sunflower | – | May 9–23 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 11–25 (transplant) | – |
| Rhubarb (crowns) | – | Apr 11–25 (transplant) | – |
| Strawberry (plants) | – | Apr 11–25 (transplant) | Aug 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: Clarion 3 SW, PA (NOAA GHCN-Daily ID USC00361485), elevation 1,040 ft, 9.2 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Tionesta 2 SE Lake, PA | 15 mi | May 1 | Oct 25 |
| Franklin, PA | 16 mi | May 2 | Oct 23 |
| Cooksburg 2 NW, PA | 18 mi | May 13 | Oct 7 |
The average last-frost dates of these stations span 12 days, a rough guide to local variation. See data sources & methods.
Frost questions for 16331
When is the last frost in 16331?
The average (50% chance) last spring freeze of 32°F for ZIP 16331 is May 9. For a more cautious planting date, use May 24, when only 1 year in 10 still sees a later freeze.
When is the first frost in 16331?
The average first fall freeze is October 11. In 1 year in 10 it comes by September 30.
What hardiness zone is 16331?
ZIP 16331 is in USDA zone 6a (-10 to -5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 16331 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
16319 16364 16232 Knox 16334 16254 Marianne 16346 Seneca 16326 16373 Emlenton
Other ZIP codes in Clarion County
16036 16049 16054 16213 16214 16220 16224 16230 16232 16233 16235 16242 16248 16254 16255 16258 16260 16326 16332 16334 16361 All Clarion County frost dates · Pennsylvania 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.