Fall in zone 7bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 19090 (Willow Grove, 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, Willow Grove NAS, PA (4 miles away).
- Average last spring frostApr 1150% chance of a 32°F freeze after this date
- Average first fall frostNov 150% chance of a 32°F freeze by this date
- Growing season (frost-free)205 daysmedian, 32°F threshold
- USDA hardiness zone7b5 to 10°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
61°F 55°F or warmer
24-hour average · latest 58°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Avondale 2 N (40 mi).
4-inch depth
62°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Avondale 2 N (40 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 19090 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 62°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: Transition zone. Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about May 27 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Tall fescue (cool-season): Early fall: September (main feeding); Late fall: November, while still green; Late winter: Optional light feeding February–March. Avoid: Feeding after mid-spring and through summer in the transition zone (stress and brown patch).
Plant now
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 1: 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 29 |
| 50% (the "average" last frost) | Apr 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 27 |
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 17 |
| 50% (the "average" first frost) | Nov 1 |
| 90% (late: most years have frozen by now) | Nov 17 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 24 | Oct 21 |
| 32°F (freeze) | Apr 11 | Nov 1 |
| 28°F (hard freeze) | Mar 30 | Nov 13 |
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 19090
Dates count from your average last spring frost (Apr 11) and first fall frost (Nov 1). 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 14–28 | Apr 18–May 2 (transplant) | – |
| Pepper (sweet and hot) | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Eggplant | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Tomatillo | Feb 14–28 | Apr 18–May 2 (transplant) | – |
| Lettuce | Feb 14–28 | Mar 21–Apr 11 (transplant) Mar 14–Apr 25 (sow outdoors) | Sep 6–27 (transplant) Aug 23–Sep 20 (sowing) |
| Spinach | – | Feb 28–Mar 21 (sow outdoors) | Sep 6–27 (sowing) |
| Kale | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 9–Sep 6 (transplant) Jul 26–Aug 23 (sowing) |
| Collards | Feb 14–28 | Mar 14–Apr 11 (transplant) Mar 14–Apr 11 (sow outdoors) | Aug 9–Sep 6 (transplant) Jul 26–Aug 23 (sowing) |
| Broccoli | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 26–Aug 23 (transplant) |
| Cabbage | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 26–Aug 23 (transplant) |
| Cauliflower | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) | Jul 26–Aug 23 (transplant) |
| Brussels sprouts | Jan 17–31 | Mar 14–28 (transplant) | Jul 12–Aug 2 (transplant) |
| Kohlrabi | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 23–Sep 6 (sowing) |
| Bok choy / Asian greens | – | Mar 14–28 (sow outdoors) | Sep 6–20 (sowing) |
| Arugula | – | Mar 14–Apr 11 (sow outdoors) | Sep 6–Oct 4 (sowing) |
| Mustard greens | – | Mar 14–Apr 4 (sow outdoors) | Sep 6–20 (sowing) |
| Swiss chard | Feb 28–Mar 14 | Mar 28–Apr 18 (transplant) Mar 28–Apr 25 (sow outdoors) | Aug 23–Sep 6 (sowing) |
| Beet | – | Mar 14–Apr 11 (sow outdoors) | Aug 23–Sep 6 (sowing) |
| Carrot | – | Mar 21–Apr 18 (sow outdoors) | Aug 9–23 (sowing) |
| Radish | – | Mar 7–Apr 18 (sow outdoors) | Sep 20–Oct 4 (sowing) |
| Turnip | – | Mar 14–Apr 4 (sow outdoors) | Aug 23–Sep 6 (sowing) |
| Parsnip | – | Mar 21–Apr 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 14–Mar 14 (sow outdoors) | Aug 9–23 (sowing) |
| Onion (bulbing) | Jan 17–31 | Feb 28–Mar 14 (transplant) | – |
| Green onion / scallion | – | Feb 28–Mar 28 (sow outdoors) | Aug 23–Sep 6 (sowing) |
| Leek | Jan 17–31 | Mar 14–28 (transplant) | – |
| Garlic | – | – | Sep 20–Oct 18 (sowing) |
| Shallot | – | Feb 28–Mar 14 (transplant) | Sep 20–Oct 18 (sowing) |
| Potato | – | Mar 14–28 (transplant) | Jul 12–26 (transplant) |
| Sweet potato | – | May 2–16 (transplant) | – |
| Sweet corn | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, pole | – | Apr 18–May 2 (sow outdoors) | – |
| Lima bean | – | Apr 25–May 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 2–23 (sow outdoors) | – |
| Cucumber | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Summer squash / zucchini | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Winter squash | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Pumpkin | – | Apr 18–May 2 (sow outdoors) | – |
| Watermelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Okra | Feb 28–Mar 14 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Celery | Jan 17–31 | Apr 18–25 (transplant) | – |
| Basil | Feb 28–Mar 14 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Cilantro | – | Mar 28–Apr 25 (sow outdoors) | Sep 6–20 (sowing) |
| Parsley | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) Mar 21–Apr 11 (sow outdoors) | – |
| Dill | – | Apr 11–25 (sow outdoors) | Sep 6–20 (sowing) |
| Sunflower | – | Apr 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 14–28 (transplant) | – |
| Rhubarb (crowns) | – | Mar 14–28 (transplant) | – |
| Strawberry (plants) | – | Mar 14–28 (transplant) | Aug 23–Sep 20 (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: Willow Grove NAS, PA (NOAA GHCN-Daily ID USW00014793), elevation 361 ft, 3.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Philadelphia NE AP, PA | 8 mi | Apr 4 | Nov 7 |
| Neshaminy Falls, PA | 9 mi | Apr 21 | Oct 25 |
| Norristown, PA | 12 mi | Apr 8 | Oct 31 |
The average last-frost dates of these stations span 17 days, a rough guide to local variation. See data sources & methods.
Frost questions for 19090
When is the last frost in 19090?
The average (50% chance) last spring freeze of 32°F for ZIP 19090 is April 11. For a more cautious planting date, use April 27, when only 1 year in 10 still sees a later freeze.
When is the first frost in 19090?
The average first fall freeze is November 1. In 1 year in 10 it comes by October 17.
What hardiness zone is 19090?
ZIP 19090 is in USDA zone 7b (5 to 10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 19090 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
19001 Roslyn 19025 19040 Horsham 19044 Horsham 19009 Bryn Athyn 19046 Jenkintown 19006 19038 Wyndmoor
Other ZIP codes in Montgomery County
18041 18054 18070 18073 18074 18076 18915 18936 18964 18969 19001 19002 19004 19006 19009 19012 19025 19027 19031 19034 19035 19038 19040 19044 All Montgomery County frost dates · Pennsylvania 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.