The Pittsburgh area is considered Zone 6B.Click to see full answer. In this manner, what zone is Pennsylvania for planting?Pennsylvania zones include 5a, 5b, 6a, 6b, 7a and a very small section of 7b. If you have a difficult time finding your location on the above map, you can visit the USDA site where you can input your zip code to find out exactly which zone you are in.Likewise, how do I determine my planting zone? If you see a hardiness zone in a gardening catalog or plant description, chances are it refers to this USDA map. To find your USDA Hardiness Zone, enter your zip code or use the map below. Click here for more information about hardiness maps. Find your zone using the map below or enter your zip code. Besides, what zone is Pittsburgh Pennsylvania for planting? 6b When can I plant in Pittsburgh?Pittsburgh is USDA Plant Hardiness Zone 6, so the average last frost date in spring is around May 15, and first frost date in fall is around October 15. The dates listed below are for earliest harvests, but many can also be planted or re-planted later in the season.