Conditional — Some Areas
black haw viburnum (zones 4-10) has limited zone overlap with Iowa (4b-5b). Only zones 4-5 in the state are suitable.
Your yard isn't the whole zone.
Iowa spans zones 4b-5b, 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 black haw viburnum against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Black Haw Viburnum Needs
- USDA Zones: 4-10
- Soil pH: 4.8 - 7.5
- Sun: Shade
- Frost-Free Days: 110+
Iowa Has
- USDA Zones: 4b-5b
- Last Frost: Apr 20 - May 15
- First Frost: Sep 25 - Oct 15
- Annual Rainfall: 26-36 inches
- Common Soils: Prairie loess, Silt loam, Clay loam
Plant Zone Range (zones 4-10)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Black Haw Viburnum in Iowa
The frost window
Across Iowa, the last spring frost clears between Apr 20 and May 15, and the first fall frost lands between Sep 25 and Oct 15 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 133-day window you can count on — up to 178 days on a mild site in a kind year.
Frost hardiness
Black Haw Viburnum is cold-hardy to -33°F (USDA PLANTS Database), so you can plant on the early side of Iowa's window — even a few weeks before the final frost date.
Establishment timing
As a long-lived plant, black haw viburnum isn't racing the calendar to a harvest date. Plant it in spring once the last-frost window passes so roots settle in through the full season, or in early fall while the soil still holds summer warmth.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Black Haw Viburnum wants 110+ frost-free days; a typical Iowa site sees ~170 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Black Haw Viburnum likes near-neutral soil (pH 4.8-7.5). That's the common-ground band across Iowa's prairie loess and silt loam — a soil test confirms it for your site.
Plant pH and drainage requirements from USDA PLANTS Database. Iowa soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Black Haw Viburnum in Iowa — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 4-10 (USDA PLANTS Database)
- State Zones: 4b-5b (USDA ARS PHZM 2023)
- Growing Season: Apr 20 - May 15 to Sep 25 - Oct 15 (NOAA Climate Normals)
What Else to Consider
Zone compatibility tells you about winter cold survival — but Iowa growers also need to think about:
Cold winters reaching -20F or below
Choose perennials rated a zone hardier than yours — Iowa winters test the margins, and the margin is where plants are lost.
Variable spring weather delays planting
Let soil temperature and your local frost normal call the start, not the calendar — a two-week wait beats a replant.
Wind exposure on open prairies desiccates plants
Even a simple windbreak — a shrub row, a snow fence, a tall cover crop — cuts wind desiccation dramatically.
Pollinator + Wildlife Value
Black Haw Viburnum draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Iowa Cooperative Extension
For Iowa-specific cultivar recommendations, planting calendars, and pest pressure for black haw viburnum, the canonical source is Iowa State University Extension and Outreach. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Black Haw Viburnum native to Iowa?
Black Haw Viburnum is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Iowa. It can still earn a place in a Iowa garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Iowa growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Black Haw Viburnum in Iowa
When can I plant Black Haw Viburnum in Iowa?
Iowa's last spring frost clears between Apr 20 and May 15, and the first fall frost lands between Sep 25 and Oct 15 (NOAA Climate Normals 1991-2020). Black Haw Viburnum is a long-lived planting, so target spring just after your local last frost — or early fall while the soil holds warmth — and let it establish through the season.
What hardiness zone is Black Haw Viburnum grown in across Iowa?
Iowa spans USDA hardiness zones 4b-5b (USDA ARS PHZM 2023). Black Haw Viburnum carries a range of zones 4-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Iowa site have?
A typical Iowa site sees ~170 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Black Haw Viburnum needs 110+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Black Haw Viburnum native to Iowa?
Black Haw Viburnum is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Iowa. It can still earn a place in a Iowa garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Black Haw Viburnum in Iowa?
Black Haw Viburnum prefers pH 4.8-7.5 (USDA PLANTS Database). That sits in the common-ground band across Iowa soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Black Haw Viburnum actually grow on my specific land in Iowa?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores black haw viburnum 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 Iowa
State-level data is a sketch. Your Growable Ground report scores black haw viburnum against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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