Yes — Strong Match
prairie coneflower (zones 3-9) covers every zone Delaware contains (7a-8a), so hardiness is not what limits it anywhere in the state.
Prairie Coneflower in Delaware — the short answer
Prairie Coneflower in Delaware: hardy in zones 3–9, full sun.
- Plant zones
- 3-9
- Not verified
- Delaware zones
- 7a-8a
- USDA PHZM 2023
- Frost window
- Mar 23 - Mar 23 – Nov 17 - Nov 19
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 238 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.
Delaware spans zones 7a-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 prairie coneflower against your parcel's actual hardiness, soil, and sun.
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Where in Delaware Fits Best
Even within Delaware's zones 7a-8a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for prairie coneflower (USDA PHZM 2023):
Zone Comparison
Prairie Coneflower Needs
- USDA Zones: 3-9
- Sun: Full Sun
- Mature size: 3.1 ft tall
- Picking window: ~45 days of harvestWe haven't confirmed this against a published source yet.
- Drought tolerance: Medium
Delaware Has
- USDA Zones: 7a-8a
- Last Hard Freeze (28°F): Mar 23 - Mar 23
- First Hard Freeze (28°F): Nov 17 - Nov 19
- Annual Rainfall: 42-48 inches
- Common Soils: Sandy loam, Silt loam, Tidal marsh
Plant Zone Range (zones 3-9)
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 Prairie Coneflower in Delaware
The frost window
Across Delaware, the last spring hard freeze (28°F) clears between Mar 23 and Mar 23, and the first fall hard freeze lands between Nov 17 and Nov 19 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 239-day window you can count on — up to 241 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
Delaware runs as cold as USDA zone 7, and no sourced winter-hardiness floor is on record for prairie coneflower, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether prairie coneflower is a permanent planting or a replant-every-spring crop for you turns on your own zone within Delaware; 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.
Soil + Drainage Fit
Prairie Coneflower likes near-neutral soil (pH 5.9-7). That's the common-ground band across Delaware's sandy loam and silt loam — a soil test confirms it for your site.
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. Delaware soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Prairie Coneflower in Delaware
Zone compatibility tells you about winter cold survival — but Delaware growers also need to think about:
Sandy soils in southern DE drain too quickly
Salt spray damage near the coast
Rising water tables in low-lying areas
What to actually do about these — and the constraints that apply to every Delaware grower, not just prairie coneflower — is covered on the Delaware growing guide.
Where in Delaware Prairie Coneflower Is Zone-Hardy
Prairie Coneflower is rated for USDA zones 3–9. Every one of Delaware’s 3 counties sits inside that band — from Kent County at zone 7b to Sussex County at zone 7b — so winter cold is not what decides this plant anywhere in the state. What is left to vary is your own parcel: slope, shelter and cold-air drainage routinely move a site half a zone either way from the county figure.
The planting window moves with it. Sussex County holds its last hard freeze (28°F) until about Mar 23, while Kent County is clear by Mar 22 — 1 days apart. Set prairie coneflower 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". Prairie Coneflower’s zone 3–9 band: Not verified. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Pollinator + Wildlife Value
Prairie Coneflower draws pollinators. Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, prairie coneflower can only work that bloom inside Delaware's frost window — roughly 241 days, opening after the last 28°F freeze (Mar 23 - Mar 23) and closing at the first (Nov 17 - Nov 19), per NOAA Regional Climate Centers ACIS, 1991-2020.
Delaware Cooperative Extension
For Delaware-specific cultivar recommendations, planting calendars, and pest pressure for prairie coneflower, the canonical source is University of Delaware Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Prairie Coneflower native to Delaware?
Prairie Coneflower is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-10-19) does not record it growing in Delaware. It can still earn a place in a Delaware garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Delaware growing guide lists plants that USDA PLANTS records growing in Delaware and that Kew and NatureServe Explorer both list in its native range, leaving out any that NatureServe flags as exotic there or that our audit holds.
State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.
Common Questions About Growing Prairie Coneflower in Delaware
When can I plant Prairie Coneflower in Delaware?
Delaware's last spring hard freeze (28°F) clears between Mar 23 and Mar 23, and the first fall hard freeze lands between Nov 17 and Nov 19 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Prairie Coneflower, so this page does not state whether it overwinters in Delaware 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 Prairie Coneflower grown in across Delaware?
Delaware spans USDA hardiness zones 7a-8a (USDA ARS PHZM 2023). Prairie Coneflower carries a range of zones 3-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Delaware site have?
A typical Delaware site sees ~241 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Prairie Coneflower needs 90+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Prairie Coneflower native to Delaware?
Prairie Coneflower is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-10-19) does not record it growing in Delaware. It can still earn a place in a Delaware garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Prairie Coneflower in Delaware?
Prairie Coneflower prefers pH 5.9-7 (USDA NRCS PLANTS Database). That sits in the common-ground band across Delaware soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Prairie Coneflower actually grow on my specific land in Delaware?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores prairie coneflower 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 Delaware
State-level data is a sketch. Your Growable Ground report scores prairie coneflower against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Delaware prairie coneflower averages can't show:
We read public map data around Delaware — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Delaware prairie coneflower average
Explore More
Growing guides for prairie coneflower
Where else prairie coneflower grows
Prairie Coneflower's zone band crosses state lines — these are the states closest to Delaware 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 Delaware
Delaware has a growing page for 1,005 plants — a rotating sample of the rest of the shelf.
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