Unlikely — Zone Mismatch
knockout rose (zones 5-11) does not overlap with North Dakota's zone range (3b-4b). Growing outdoors is unlikely without significant protection.
Your yard isn't the whole zone.
North Dakota spans zones 3b-4b, 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 knockout rose against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Knockout Rose Needs
- USDA Zones: 5-11
- Sun: Part Sun
- Mature size: 4 ft tall
- Picking window: ~28 days of harvest
- Drought tolerance: Medium
North Dakota Has
- USDA Zones: 3b-4b
- Last Hard Freeze (28°F): Apr 30 - May 6
- First Hard Freeze (28°F): Oct 4 - Oct 9
- Annual Rainfall: 14-22 inches
- Common Soils: Prairie loam, Clay (Red River Valley), Sandy loam
Plant Zone Range (zones 5-11)
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Knockout Rose in North Dakota
The frost window
Across North Dakota, the last spring hard freeze (28°F) clears between Apr 30 and May 6, and the first fall hard freeze lands between Oct 4 and Oct 9 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 151-day window you can count on — up to 162 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
North Dakota runs as cold as USDA zone 3, and no sourced winter-hardiness floor is on record for knockout rose, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether knockout rose is a permanent planting or a replant-every-spring crop for you turns on your own zone within North Dakota; check its hardiness range against that before treating it as long-lived ground.
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
The zone check says knockout rose does not survive a North Dakota winter in the ground. The season figures below measure a different question — whether it could finish a season here at all — and they only bear on North Dakota under protection.
Chill hours
Knockout Rose requires ~200 chill hours (32-45°F dormancy window). North Dakota 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
Drainage matters: this plant wants well (dry spells). If your North Dakota site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. North Dakota soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Knockout Rose in North Dakota — Quick Answer
- Verdict: Unlikely — Zone Mismatch
- Plant Zones: 5-11 (USDA PLANTS Database)
- State Zones: 3b-4b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Apr 30 - May 6 to Oct 4 - Oct 9 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Knockout Rose in North Dakota
Zone compatibility tells you about winter cold survival — but North Dakota growers also need to think about:
Extreme cold (-40F) and short growing season
Persistent wind desiccates plants
Low rainfall in western ND
What to actually do about these — and the constraints that apply to every North Dakota grower, not just knockout rose — is covered on the North Dakota growing guide.
Where in North Dakota Knockout Rose Is Zone-Hardy
Knockout Rose is rated for USDA zones 5–11. No North Dakota county reaches it. Even Stutsman County, the state’s mildest winter at zone 4b, sits below the plant’s zone 5 floor — so in open ground this one needs winter protection here, or a container that comes under cover.
Across those 53 counties North Dakota’s winter-low ladder runs from zone 3b in Bottineau County to zone 4b in Stutsman County — 1 USDA zone of spread, which is 10°F between the two counties’ average coldest night of the year. None of that range reaches the band knockout rose needs, so here the statewide answer really is the answer.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. Knockout Rose’s zone 5–11 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
Knockout Rose draws honeybees and native bees (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, knockout rose can only work that bloom inside North Dakota's frost window — roughly 157 days, opening after the last 28°F freeze (Apr 30 - May 6) and closing at the first (Oct 4 - Oct 9), per NOAA Regional Climate Centers ACIS, 1991-2020.
North Dakota Cooperative Extension
For North Dakota-specific cultivar recommendations, planting calendars, and pest pressure for knockout rose, the canonical source is NDSU Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
What pests threaten knockout rose in North Dakota?
Japanese beetle is documented in North Dakota, and it hits knockout rose where it counts. Here is what it actually does — and the move that beats it.
Japanese beetle
Act on thisdocumented in part of this stateRose is at the top of the Japanese beetle's preferred-plant list, and it is the one case where 'cosmetic' misses the point: the University of Minnesota notes healthy roses survive the feeding, but the blossoms are often ruined — the thing you grow the plant for.
What to do: Handpick or knock beetles into a bucket of soapy water, daily, in the cool of morning or evening — damaged leaves release an odor that pulls in more beetles, so removing them lowers next week's numbers. Handpick while the plant is in bloom, then net it once flowering is done. Skip the pheromone traps: University of Kentucky research found they draw in more beetles than they catch.
Documented range: states listed as Japanese-beetle infested · University of Minnesota Extension, National Plant Board
Only pests whose documented range and host relationship both trace to a primary source appear here — so a quiet section means we have nothing sourced to tell you, not that your garden is pest-free.
Common Questions About Growing Knockout Rose in North Dakota
When can I plant Knockout Rose in North Dakota?
North Dakota's last spring hard freeze (28°F) clears between Apr 30 and May 6, and the first fall hard freeze lands between Oct 4 and Oct 9 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Knockout Rose, so this page does not state whether it overwinters in North Dakota 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 Knockout Rose grown in across North Dakota?
North Dakota spans USDA hardiness zones 3b-4b (USDA ARS PHZM 2023). Knockout Rose 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 North Dakota site have?
A typical North Dakota site sees ~157 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Knockout Rose 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.
Will Knockout Rose actually grow on my specific land in North Dakota?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores knockout rose 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 North Dakota
State-level data is a sketch. Your Growable Ground report scores knockout rose against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that North Dakota knockout rose averages can't show:
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