Generally — Most Areas
red twig dogwood (zones 2-7) suits most of Pennsylvania (5b-8a) — zones 5-7 are in range, and the rest of the state is the exception.
Red Twig Dogwood in Pennsylvania — the short answer
Red Twig Dogwood in Pennsylvania: hardy in zones 2–7, part sun, against a state median of ~197 frost-free days.
- Plant zones
- 2-7
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Pennsylvania zones
- 5b-8a
- USDA PHZM 2023
- Frost window
- Apr 6 - Apr 24 – Oct 25 - Nov 3
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 160 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Pennsylvania spans zones 5b-8a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score red twig dogwood against your parcel's actual hardiness, soil, and sun.
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Pennsylvania is not one climate
Pennsylvania’s winter-low ladder runs across 67 counties, from zone 5.5 in Cambria County to zone 7.5 in Philadelphia County. That is 20°F between the two counties’ average coldest night — the difference between red twig dogwood overwintering in the ground and coming under cover.
The middle half of 67 counties runs 6–7 zones, with a median of 6.5 zones — a 2-zone span end to end.
Measured across 67 Pennsylvania counties. USDA PHZM 2023, per county. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Pennsylvania Fits Best
Red Twig Dogwood is rated for zones 2–7 — a cold floor USDA puts at -50 to -40°F. Against Pennsylvania’s 67 counties that band holds in 65 of them, and the line runs at Cambria County (zone 5b), the coldest county still inside it.
Inside zones 2–7
65 counties
- Cameron County · zone 5b
- Elk County · zone 5b
- McKean County · zone 5b
3 of 65 shown
Above the zone 7 ceiling
2 counties
- Delaware County · zone 7b
- Philadelphia County · zone 7b
Too little winter chill rather than too much cold — a low-chill selection is what changes it.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. A zone is a 10°F band of average annual extreme minimum temperature, so the floor above is the band the plant's rating denotes, not a single measured kill point. Slope, shelter and cold-air drainage routinely move a site half a zone either way from its county figure — which is the part only your address resolves.
Even within Pennsylvania's zones 5b-8a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for red twig dogwood (USDA PHZM 2023):
Zone Comparison
Red Twig Dogwood Needs
- USDA Zones: 2-7
- Sun: Part Sun
- Mature size: 8 ft tall
- Drought tolerance: Low
Pennsylvania Has
- USDA Zones: 5b-8a
- Last Hard Freeze (28°F): Apr 6 - Apr 24
- First Hard Freeze (28°F): Oct 25 - Nov 3
- Annual Rainfall: 36-48 inches
- Common Soils: Silt loam, Shale-derived, Limestone-derived
Plant Zone Range (zones 2-7)
Preferred Soil pH
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Red Twig Dogwood in Pennsylvania
The frost window
Across Pennsylvania, the last spring hard freeze (28°F) clears between Apr 6 and Apr 24, and the first fall hard freeze lands between Oct 25 and Nov 3 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 184-day window you can count on — up to 211 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
Pennsylvania runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for red twig dogwood, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether red twig dogwood is a permanent planting or a replant-every-spring crop for you turns on your own zone within Pennsylvania; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
The zone check says red twig dogwood survives winter in part of Pennsylvania, not across all of it. Whether the season is long enough — and warm enough — is a different question.
Chill hours
Red Twig Dogwood requires ~500 chill hours (32-45°F dormancy window). Pennsylvania typically banks ~2500 chill hours per winter (from PRISM 1991-2020 climate normals), which keeps this plant on track.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Red Twig Dogwood tolerates a wide pH range (pH 3.9-7.7) — 3.8 units, acid ground through alkaline — so soil acidity is rarely what limits it in Pennsylvania. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant. It will grow across that whole span, but it does best between pH 5.5 and 7.5 — worth knowing before you decide whether a Pennsylvania soil test result is a problem or just a number. Drainage matters: this plant wants poorly (saturated >50% of year), well (dry spells). If your Pennsylvania site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Pennsylvania soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Red Twig Dogwood in Pennsylvania
Zone compatibility tells you about winter cold survival — but Pennsylvania growers also need to think about:
Rocky shale soils in the ridge-and-valley region
Short mountain seasons in the Poconos and Alleghenies
Deer pressure is among the highest in the US
What to actually do about these — and the constraints that apply to every Pennsylvania grower, not just red twig dogwood — is covered on the Pennsylvania growing guide.
Where in Pennsylvania Red Twig Dogwood Is Zone-Hardy
Red Twig Dogwood is rated for USDA zones 2–7. 65 of Pennsylvania’s 67 counties fall inside that band. The coldest that does is Cambria County at zone 5b. 2 counties sit above its zone 7 ceiling, where the limit is too little winter chill rather than too much cold. Where you are in Pennsylvania decides this one.
Across those 67 counties Pennsylvania’s winter-low ladder runs from zone 5b in Cambria County to zone 7b in Philadelphia County — 2 USDA zones of spread, which is 20°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Potter County holds its last hard freeze (28°F) until about May 5, while Philadelphia County is clear by Mar 19 — 47 days apart. Set red twig dogwood out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Red Twig Dogwood’s zone 2–7 band: USDA PLANTS / Growable Ground plant database. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Pollinator + Wildlife Value
Red Twig Dogwood draws honeybees, native bees, and butterflies (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, red twig dogwood can only work that bloom inside Pennsylvania's frost window — roughly 197 days, opening after the last 28°F freeze (Apr 6 - Apr 24) and closing at the first (Oct 25 - Nov 3), per NOAA Regional Climate Centers ACIS, 1991-2020.
Pennsylvania Cooperative Extension
For Pennsylvania-specific cultivar recommendations, planting calendars, and pest pressure for red twig dogwood, the canonical source is Penn State Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Red Twig Dogwood in Pennsylvania
When can I plant Red Twig Dogwood in Pennsylvania?
Pennsylvania's last spring hard freeze (28°F) clears between Apr 6 and Apr 24, and the first fall hard freeze lands between Oct 25 and Nov 3 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Red Twig Dogwood, so this page does not state whether it overwinters in Pennsylvania and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Red Twig Dogwood grown in across Pennsylvania?
Pennsylvania spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Red Twig Dogwood carries a range of zones 2-7, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Pennsylvania site have?
A typical Pennsylvania site sees ~197 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Red Twig Dogwood should be matched against that window, so check whether your local microclimate runs above or below the state average before settling on a planting date.
How should I amend the soil for Red Twig Dogwood in Pennsylvania?
Red Twig Dogwood tolerates pH 3.9-7.7 and poorly (saturated >50% of year), well (dry spells) drainage (FAO ECOCROP). That is a 3.8-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Pennsylvania site — amend for drainage and organic matter first.
Will Red Twig Dogwood actually grow on my specific land in Pennsylvania?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores red twig dogwood against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Pennsylvania
State-level data is a sketch. Your Growable Ground report scores red twig dogwood against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Pennsylvania red twig dogwood averages can't show:
We read public map data around Pennsylvania — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Pennsylvania red twig dogwood average
Explore More
Growing guides for red twig dogwood
Explore Pennsylvania county by county
Pennsylvania carries 67 counties with their own USDA zone — a sample of the growing pages for red twig dogwood there:
Where else red twig dogwood grows
Red Twig Dogwood's zone band crosses state lines — these are the states closest to Pennsylvania in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Pennsylvania
Pennsylvania has a growing page for 893 plants — a rotating sample of the rest of the shelf.
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