Yes — Strong Match
Maximilian sunflower (zones 4-9) covers every zone Michigan contains (4a-7a), so hardiness is not what limits it anywhere in the state.
Maximilian Sunflower in Michigan — the short answer
Maximilian Sunflower in Michigan: hardy in zones 4–9, full sun, against a state median of ~186 frost-free days.
- Plant zones
- 4-9
- 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
- Michigan zones
- 4a-7a
- USDA PHZM 2023
- Frost window
- Apr 19 - May 8 – Oct 12 - Oct 31
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 126 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.
Michigan spans zones 4a-7a, 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 maximilian sunflower against your parcel's actual hardiness, soil, and sun.
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Michigan is not one climate
Michigan’s winter-low ladder runs across 83 counties, from zone 4 in Gogebic County to zone 7 in Allegan County. That is 30°F between the two counties’ average coldest night — the difference between maximilian sunflower overwintering in the ground and coming under cover.
The middle half of 83 counties runs 5–6 zones, with a median of 6 zones — a 3-zone span end to end.
Measured across 83 Michigan 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 Michigan Fits Best
Even within Michigan's zones 4a-7a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for maximilian sunflower (USDA PHZM 2023):
Zone Comparison
Maximilian Sunflower Needs
- USDA Zones: 4-9
- Frost-Free Days: 70+
- Sun: Full Sun
- Mature size: 8 ft tall
- Picking window: ~45 days of harvest
- Drought tolerance: Medium
Michigan Has
- USDA Zones: 4a-7a
- Last Hard Freeze (28°F): Apr 19 - May 8
- First Hard Freeze (28°F): Oct 12 - Oct 31
- Annual Rainfall: 28-38 inches
- Common Soils: Sandy loam, Clay loam, Muck
Plant Zone Range (zones 4-9)
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 Maximilian Sunflower in Michigan
The frost window
Across Michigan, the last spring hard freeze (28°F) clears between Apr 19 and May 8, and the first fall hard freeze lands between Oct 12 and Oct 31 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 157-day window you can count on — up to 195 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
Michigan runs as cold as USDA zone 4, and no sourced winter-hardiness floor is on record for maximilian sunflower, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether maximilian sunflower is a permanent planting or a replant-every-spring crop for you turns on your own zone within Michigan; 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 maximilian sunflower survives winter here. Whether the season is long enough — and warm enough — is a different question.
Frost-free days
Maximilian Sunflower wants 70+ frost-free days; a typical Michigan site sees ~186 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
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
Maximilian Sunflower likes near-neutral soil (pH 5.5-8). That's the common-ground band across Michigan's sandy loam and clay loam — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6 and 7.5 — worth knowing before you decide whether a Michigan soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Michigan 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. Michigan soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Maximilian Sunflower in Michigan
Zone compatibility tells you about winter cold survival — but Michigan growers also need to think about:
Lake effect weather creates highly localized microclimates
Short northern season (100-120 frost-free days in UP)
Sandy soils in western MI drain too quickly
What to actually do about these — and the constraints that apply to every Michigan grower, not just maximilian sunflower — is covered on the Michigan growing guide.
Timing shifts within Michigan
Maximilian Sunflower needs about 70 days of frost-free season to complete its cycle. Even Iron County — Michigan’s shortest season at 126 frost-free days — clears that by 56 days, so season length isn’t the constraint anywhere in Michigan. What varies is your own parcel.
Across Michigan’s 83 counties the frost-free season runs from 126 days in Iron County to 223 days in Berrien County — a spread of 97 days, which is why a single statewide planting date misleads. The median Michigan county sees 186 frost-free days, leaving maximilian sunflower about 116 days of slack on a typical parcel — room for a second sowing where the season runs long.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Maximilian Sunflower's 70-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Maximilian Sunflower draws honeybees, native bees, and butterflies (high value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, maximilian sunflower can only work that bloom inside Michigan's frost window — roughly 186 days, opening after the last 28°F freeze (Apr 19 - May 8) and closing at the first (Oct 12 - Oct 31), per NOAA Regional Climate Centers ACIS, 1991-2020.
Michigan Cooperative Extension
For Michigan-specific cultivar recommendations, planting calendars, and pest pressure for maximilian sunflower, the canonical source is MSU Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Maximilian Sunflower native to Michigan?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Maximilian Sunflower as native to Michigan. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Maximilian Sunflower in Michigan
When can I plant Maximilian Sunflower in Michigan?
Michigan's last spring hard freeze (28°F) clears between Apr 19 and May 8, and the first fall hard freeze lands between Oct 12 and Oct 31 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Maximilian Sunflower, so this page does not state whether it overwinters in Michigan 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 Maximilian Sunflower grown in across Michigan?
Michigan spans USDA hardiness zones 4a-7a (USDA ARS PHZM 2023). Maximilian Sunflower carries a range of zones 4-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Michigan site have?
A typical Michigan site sees ~186 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Maximilian Sunflower needs 70+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Maximilian Sunflower native to Michigan?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Maximilian Sunflower as native to Michigan. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Maximilian Sunflower in Michigan?
Maximilian Sunflower prefers pH 5.5-8 and well (dry spells) drainage (FAO ECOCROP). That sits in the common-ground band across Michigan soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Maximilian Sunflower actually grow on my specific land in Michigan?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores maximilian sunflower 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 Michigan
State-level data is a sketch. Your Growable Ground report scores maximilian sunflower against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Michigan maximilian sunflower averages can't show:
We read public map data around Michigan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Michigan maximilian sunflower average
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