Yes — Strong Match
sweetspire (zones 5-11) covers every zone Pennsylvania contains (5b-8a), so hardiness is not what limits it anywhere in the state.
Sweetspire in Pennsylvania — the short answer
Sweetspire in Pennsylvania: hardy in zones 5–11, shade.
- Plant zones
- 5-11
- Rated hardy to zone 5a by NC State Extension Gardener Plant Toolbox; USDA PLANTS Database lists -24 °F, converted to zone 5a, checked Oct 2026. Ceiling: our plant database.
- Pennsylvania zones
- 5b-8a
- USDA PHZM 2023
- Frost window
- Apr 6 - Apr 24 – Oct 25 - Nov 3
- NOAA RCC ACIS 1991-2020, 28°F
- Typical season
- ~197 days
- NOAA Regional Climate Centers ACIS, 1991-2020
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 sweetspire against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Sweetspire Needs
- USDA Zones: 5-11
- Sun: ShadeWe haven't confirmed this against a published source yet.
- Mature size: 6 ft tallWe haven't confirmed this against a published source yet.
- 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 5-11)
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 Sweetspire 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 sweetspire, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether sweetspire 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 sweetspire survives winter here. Whether the season is long enough — and warm enough — is a different question.
Chill hours
Sweetspire requires ~400 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
Sweetspire tolerates a wide pH range (pH 4-7.5) — 3.5 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.
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 Sweetspire 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 sweetspire — is covered on the Pennsylvania growing guide.
Pollinator + Wildlife Value
Sweetspire draws honeybees, native bees, and butterflies (moderate value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, sweetspire 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. Pollinator value: We haven't confirmed this against a published source yet.
Pennsylvania Cooperative Extension
For Pennsylvania-specific cultivar recommendations, planting calendars, and pest pressure for sweetspire, the canonical source is Penn State Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sweetspire native to Pennsylvania?
Yes — the USDA PLANTS Database (accessed 2026-10-19) records Sweetspire in Pennsylvania, Kew's Plants of the World Online (WCVP) lists Pennsylvania in its native range, and NatureServe Explorer's state data mark it native there. Planting it supports the pollinators and wildlife that evolved alongside it.
State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.
Native-range status: Kew, Plants of the World Online — World Checklist of Vascular Plants (WCVP), release 2026-06-04, licensed CC BY 3.0. State native/exotic flags: NatureServe Explorer, CC BY, accessed 2026-10-19. powo.science.kew.org explorer.natureserve.org
Common Questions About Growing Sweetspire in Pennsylvania
When can I plant Sweetspire 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 Sweetspire, 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 Sweetspire grown in across Pennsylvania?
Pennsylvania spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Sweetspire carries a range of zones 5-11, 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). Sweetspire needs 180+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sweetspire native to Pennsylvania?
Yes — the USDA PLANTS Database (accessed 2026-10-19) records Sweetspire in Pennsylvania, Kew's Plants of the World Online (WCVP) lists Pennsylvania in its native range, and NatureServe Explorer's state data mark it native there. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Sweetspire in Pennsylvania?
Sweetspire tolerates pH 4-7.5 (USDA NRCS PLANTS Database). That is a 3.5-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 Sweetspire actually grow on my specific land in Pennsylvania?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sweetspire against your address's mapped 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 sweetspire against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Pennsylvania sweetspire 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 sweetspire average
Explore More
Growing guides for sweetspire
Where else sweetspire grows
Sweetspire'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 890 plants — a rotating sample of the rest of the shelf.
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