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Pennsylvania Planting Zone Map
Pennsylvania has USDA plant hardiness zones 5b to 8a on the 2023 USDA map. The most common zone by county is 6b (22 of 67 counties), then 6a (22).
Photo: Rows of apple trees in white blossom along a grassy orchard alley. Philip Halling, CC BY-SA 2.0, via Wikimedia Commons
Find the planting zone for your Pennsylvania county
Zones: USDA ARS 2023 Plant Hardiness Zone Map, main zone of each county by ZIP code area. Frost dates: NOAA 1991-2020 normals.
Autumn meadow below Chestnut Ridge on State Game Lands 168, Monroe County
USDA plant hardiness zone map of Pennsylvania
Official USDA Plant Hardiness Zone Map (2023), USDA Agricultural Research Service and Oregon State University PRISM Climate Group, shown reduced in size. Full-size files: USDA map downloads; interactive map: planthardiness.ars.usda.gov.
Pennsylvania counties by main zone
Each county is listed under the zone that covers most of its ZIP code area. Larger or hilly counties can span two or more zones.
Planting zone for every Pennsylvania county
| County | Main zone | Zones in county | Average coldest night | Last frost (50%) |
|---|---|---|---|---|
| Adams | 7a | 6b, 7a | 0 to 5°F | Apr 24 |
| Allegheny | 6b | 6b, 7a | -5 to 0°F | Apr 24 |
| Armstrong | 6b | 6a, 6b | -5 to 0°F | May 4 |
| Beaver | 6b | 6a, 6b | -5 to 0°F | Apr 28 |
| Bedford | 6b | 6a, 6b, 7a | -5 to 0°F | Apr 29 |
| Berks | 7a | 6b, 7a | 0 to 5°F | Apr 10 |
| Blair | 6b | 6a, 6b | -5 to 0°F | Apr 25 |
| Bradford | 6a | 6a | -10 to -5°F | May 2 |
| Bucks | 7a | 6b, 7a, 7b | 0 to 5°F | Apr 13 |
| Butler | 6a | 6a, 6b | -10 to -5°F | May 7 |
| Cambria | 6a | 6a, 6b | -10 to -5°F | May 17 |
| Cameron | 5b | 5b, 6a | -15 to -10°F | May 7 |
| Carbon | 6b | 6a, 6b, 7a | -5 to 0°F | May 7 |
| Centre | 6b | 6a, 6b | -5 to 0°F | Apr 20 |
| Chester | 7a | 7a | 0 to 5°F | Apr 19 |
| Clarion | 6a | 6a, 6b | -10 to -5°F | May 9 |
| Clearfield | 6a | 6a | -10 to -5°F | May 4 |
| Clinton | 6a | 5b, 6a, 6b | -10 to -5°F | Apr 30 |
| Columbia | 6b | 6a, 6b | -5 to 0°F | May 4 |
| Crawford | 6a | 6a | -10 to -5°F | Apr 30 |
| Cumberland | 7a | 7a | 0 to 5°F | Apr 23 |
| Dauphin | 7a | 6b, 7a | 0 to 5°F | May 1 |
| Delaware | 7b | 7a, 7b, 8a | 5 to 10°F | Mar 30 |
| Elk | 5b | 5b, 6a | -15 to -10°F | May 13 |
| Erie | 6a | 6a, 6b, 7a | -10 to -5°F | Apr 26 |
| Fayette | 6b | 6a, 6b, 7a | -5 to 0°F | Apr 30 |
| Forest | 6a | 5b, 6a | -10 to -5°F | May 1 |
| Franklin | 7a | 6b, 7a, 7b | 0 to 5°F | Apr 18 |
| Fulton | 7a | 6b, 7a | 0 to 5°F | Apr 27 |
| Greene | 6b | 6a, 6b, 7a | -5 to 0°F | May 3 |
| Huntingdon | 6b | 6b, 7a | -5 to 0°F | Apr 19 |
| Indiana | 6b | 6a, 6b | -5 to 0°F | May 8 |
| Jefferson | 6a | 5b, 6a | -10 to -5°F | May 6 |
| Juniata | 7a | 6b, 7a | 0 to 5°F | Apr 21 |
| Lackawanna | 6a | 6a, 6b, 7a | -10 to -5°F | Apr 23 |
| Lancaster | 7a | 7a | 0 to 5°F | Apr 19 |
| Lawrence | 6a | 6a, 6b | -10 to -5°F | Apr 30 |
| Lebanon | 7a | 7a | 0 to 5°F | Apr 20 |
| Lehigh | 7a | 6b, 7a | 0 to 5°F | Apr 20 |
| Luzerne | 6b | 6a, 6b, 7a | -5 to 0°F | May 7 |
| Lycoming | 6a | 6a, 6b | -10 to -5°F | Apr 25 |
| McKean | 5b | 5b | -15 to -10°F | May 18 |
| Mercer | 6a | 6a | -10 to -5°F | May 15 |
| Mifflin | 6b | 6b, 7a | -5 to 0°F | Apr 21 |
| Monroe | 6b | 6a, 6b | -5 to 0°F | May 6 |
| Montgomery | 7a | 6b, 7a, 7b | 0 to 5°F | Apr 24 |
| Montour | 6b | 6b | -5 to 0°F | Apr 26 |
| Northampton | 7a | 6b, 7a | 0 to 5°F | Apr 18 |
| Northumberland | 6b | 6b | -5 to 0°F | Apr 30 |
| Perry | 7a | 6b, 7a | 0 to 5°F | Apr 18 |
| Philadelphia | 7b | 7b | 5 to 10°F | Mar 30 |
| Pike | 6a | 6a, 6b | -10 to -5°F | May 10 |
| Potter | 5b | 5b, 6a | -15 to -10°F | May 14 |
| Schuylkill | 6b | 6b, 7a | -5 to 0°F | Apr 30 |
| Snyder | 6b | 6b | -5 to 0°F | Apr 25 |
| Somerset | 6a | 5b, 6a, 6b | -10 to -5°F | May 12 |
| Sullivan | 6a | 6a, 6b | -10 to -5°F | May 6 |
| Susquehanna | 5b | 5b, 6a | -15 to -10°F | May 14 |
| Tioga | 6a | 5b, 6a | -10 to -5°F | May 10 |
| Union | 6b | 6b | -5 to 0°F | Apr 25 |
| Venango | 6a | 6a | -10 to -5°F | May 2 |
| Warren | 6a | 5b, 6a | -10 to -5°F | May 22 |
| Washington | 6b | 6a, 6b | -5 to 0°F | Apr 24 |
| Wayne | 6a | 5b, 6a | -10 to -5°F | May 14 |
| Westmoreland | 6b | 6a, 6b | -5 to 0°F | May 1 |
| Wyoming | 6a | 6a, 6b | -10 to -5°F | Apr 23 |
| York | 7a | 6b, 7a | 0 to 5°F | Apr 26 |
When to plant in Pennsylvania: crop by crop
Planting dates for each crop in Pennsylvania, from the Penn State Extension calendar.
Pennsylvania planting zone questions
What planting zone is Pennsylvania?
Pennsylvania has USDA plant hardiness zones 5b to 8a on the 2023 USDA map. The most common zone by county is 6b (22 of 67 counties), then 6a (22).
What does a hardiness zone mean?
A USDA zone is based on the average coldest winter night from 1991 to 2020. Each zone is 10°F wide, split into a and b halves of 5°F.
Did the zones change in 2023?
Yes. USDA released a new map in November 2023 using 1991 to 2020 data. Many places moved half a zone warmer than on the 2012 map.
Does my zone tell me when to plant?
No. Zones are about which perennials survive winter. Planting dates follow frost dates; see Pennsylvania frost dates and the Pennsylvania planting calendar.
How is a county's zone worked out here?
From the USDA 2023 zone of each ZIP code, joined to Census ZIP code areas. The main zone covers most of the county's ZIP code area.
Can I use the USDA map image?
USDA publishes the official map as a public-domain image. The map on this page is the official file, reduced in size, with a link to the full-size version.
Photos: Rows of apple trees in white blossom along a grassy orchard alley: Philip Halling, CC BY-SA 2.0, via Wikimedia Commons; Reclaimed grassland of the German Settlement area overlooking the Beech Creek drainage on State Game Lands 100, Centre County: Nicholas A. Tonelli, CC BY 2.0, via Flickr; Autumn meadow below Chestnut Ridge on State Game Lands 168, Monroe County: Nicholas A. Tonelli, CC BY 2.0, via Flickr; Unripe green tomato on the plant: Microrao, CC BY-SA 4.0, via Wikimedia Commons; Pepper plant in a kitchen garden loaded with green, yellow and red peppers: NPS, Public domain, via Wikimedia Commons; Potato plant growing in a garden bed: Kolforn (Kolforn), CC BY-SA 4.0, via Wikimedia Commons; Field of sweet corn in summer: Marathon, CC BY-SA 2.0, via Wikimedia Commons; Clusters of long green bean pods hanging from a climbing bean vine: Nirajan_pant, CC BY-SA 3.0, via Wikimedia Commons; Cucumber plants growing in a greenhouse bed: HARTLEPOOLMARINA2014, CC BY-SA 4.0, via Wikimedia Commons; Zucchini plant with a yellow flower: net_efekt from Oxford, UK, CC BY 2.0, via Wikimedia Commons; Lettuce plants growing in rows: AfroBrazilian, CC BY-SA 3.0, via Wikimedia Commons; Long rows of green onion plants growing in sandy farm soil: ליזי שאנן, CC BY 2.5, via Wikimedia Commons; Neat rows of young garlic shoots growing in dark tilled soil: Timothy A. Gonsalves, CC BY-SA 4.0, via Wikimedia Commons; Pea vines on a garden trellis with white flowers and flat green pods: Forest and Kim Starr, CC BY 2.0, via Wikimedia Commons; Young watermelon plant in a garden: Forest and Kim Starr, CC BY 3.0 us, via Wikimedia Commons.