Generally — Most Areas
bottlebrush grass (zones 5-8) suits most of Vermont (4a-6a) — zones 5-6 are in range, and the rest of the state is the exception.
Bottlebrush Grass in Vermont — the short answer
Bottlebrush Grass in Vermont: hardy in zones 5–8, full sun.
- Plant zones
- 5-8
- Not verified — NC State Extension Gardener Plant Toolbox lists zones 5a–9b
- Vermont zones
- 4a-6a
- USDA PHZM 2023
- Frost window
- Apr 27 - May 5 – Oct 10 - Oct 17
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 146 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.
Vermont spans zones 4a-6a, 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 bottlebrush grass against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Vermont is not one climate
Vermont’s winter-low ladder runs across 14 counties, from zone 4.5 in Caledonia County to zone 5.5 in Windsor County. That is 10°F between the two counties’ average coldest night — the difference between bottlebrush grass overwintering in the ground and coming under cover.
The middle half of 14 counties runs 4.5–5 zones, with a median of 5 zones — a 1-zone span end to end.
Measured across 14 Vermont 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 Vermont Fits Best
Bottlebrush Grass is rated for zones 5–8 — a cold floor USDA puts at -20 to -10°F. Against Vermont’s 14 counties that band holds in 9 of them, and the line runs at Addison County (zone 5a), the coldest county still inside it.
Inside zones 5–8
9 counties
- Bennington County · zone 5a
- Chittenden County · zone 5a
- Grand Isle County · zone 5a
3 of 9 shown
Below the zone 5 floor
5 counties
- Caledonia County · zone 4b
- Essex County · zone 4b
- Franklin County · zone 4b
3 of 5 shown
Winter cold is the limit here — the same plant works in a container that comes under cover.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. A zone is a 10°F band of average annual extreme minimum temperature, so the floor above is the band the plant's rating denotes, not a single measured kill point. Slope, shelter and cold-air drainage routinely move a site half a zone either way from its county figure — which is the part only your address resolves.
Even within Vermont's zones 4a-6a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for bottlebrush grass (USDA PHZM 2023):
Zone Comparison
Bottlebrush Grass Needs
- USDA Zones: 5-8
- Sun: Full SunWe haven't confirmed this against a published source yet.
Vermont Has
- USDA Zones: 4a-6a
- Last Hard Freeze (28°F): Apr 27 - May 5
- First Hard Freeze (28°F): Oct 10 - Oct 17
- Annual Rainfall: 34-44 inches
- Common Soils: Glacial till, Clay, Silt loam
Plant Zone Range (zones 5-8)
Preferred Soil pH
We haven't confirmed this against a published source yet.
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 Bottlebrush Grass in Vermont
The frost window
Across Vermont, the last spring hard freeze (28°F) clears between Apr 27 and May 5, and the first fall hard freeze lands between Oct 10 and Oct 17 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 158-day window you can count on — up to 173 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
Vermont runs as cold as USDA zone 4, and no sourced winter-hardiness floor is on record for bottlebrush grass, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether bottlebrush grass is a permanent planting or a replant-every-spring crop for you turns on your own zone within Vermont; 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
Bottlebrush Grass tolerates a wide pH range (pH 5-8.2) — 3.2 units, acid ground through alkaline — so soil acidity is rarely what limits it in Vermont. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant. It will grow across that whole span, but it does best between pH 5.5 and 6.5 — worth knowing before you decide whether a Vermont soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells), excessive (dry/moderately dry). If your Vermont site is heavier clay or sits in a low spot, a raised bed lifts the roots above wet ground, or work in compost. pH range, preferred pH and drainage need: We haven't confirmed this against a published source yet.
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. Vermont soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Bottlebrush Grass in Vermont
Zone compatibility tells you about winter cold survival — but Vermont growers also need to think about:
Short growing season (100-130 frost-free days)
Rocky soils throughout the Green Mountains
Heavy clay in the Champlain Valley
What to actually do about these — and the constraints that apply to every Vermont grower, not just bottlebrush grass — is covered on the Vermont growing guide.
Where in Vermont Bottlebrush Grass Is Zone-Hardy
Bottlebrush Grass is rated for USDA zones 5–8. 9 of Vermont’s 14 counties fall inside that band. The coldest that does is Addison County at zone 5a. 5 counties sit below the plant’s zone 5 floor, where an unprotected plant is relying on snow cover and a mild year. Where you are in Vermont decides this one.
Across those 14 counties Vermont’s winter-low ladder runs from zone 4b in Caledonia County to zone 5b in Windsor County — 1 USDA zone of spread, which is 10°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Essex County holds its last hard freeze (28°F) until about May 13, while Grand Isle County is clear by Apr 20 — 23 days apart. Set bottlebrush grass 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". Bottlebrush Grass’s zone 5–8 band: Not verified — NC State Extension Gardener Plant Toolbox lists zones 5a–9b. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Vermont Cooperative Extension
For Vermont-specific cultivar recommendations, planting calendars, and pest pressure for bottlebrush grass, the canonical source is UVM Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Bottlebrush Grass native to Vermont?
Yes — the USDA PLANTS Database (accessed 2026-10-19) records Bottlebrush Grass in Vermont, Kew's Plants of the World Online (WCVP) lists Vermont 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 Bottlebrush Grass in Vermont
When can I plant Bottlebrush Grass in Vermont?
Vermont's last spring hard freeze (28°F) clears between Apr 27 and May 5, and the first fall hard freeze lands between Oct 10 and Oct 17 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Bottlebrush Grass, so this page does not state whether it overwinters in Vermont 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 Bottlebrush Grass grown in across Vermont?
Vermont spans USDA hardiness zones 4a-6a (USDA ARS PHZM 2023). Bottlebrush Grass carries a range of zones 5-8, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Vermont site have?
A typical Vermont site sees ~163 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Bottlebrush Grass 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 Bottlebrush Grass native to Vermont?
Yes — the USDA PLANTS Database (accessed 2026-10-19) records Bottlebrush Grass in Vermont, Kew's Plants of the World Online (WCVP) lists Vermont 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 Bottlebrush Grass in Vermont?
Bottlebrush Grass tolerates pH 5-8.2 and well (dry spells), excessive (dry/moderately dry) drainage. We haven't confirmed this against a published source yet. That is a 3.2-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Vermont site — amend for drainage and organic matter first.
Will Bottlebrush Grass actually grow on my specific land in Vermont?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores bottlebrush grass 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 Vermont
State-level data is a sketch. Your Growable Ground report scores bottlebrush grass against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Vermont bottlebrush grass averages can't show:
We read public map data around Vermont — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Vermont bottlebrush grass average
Explore More
Growing guides for bottlebrush grass
Explore Vermont county by county
Vermont carries 14 counties with their own USDA zone — a sample of the growing pages for bottlebrush grass there:
Where else bottlebrush grass grows
Bottlebrush Grass's zone band crosses state lines — these are the states closest to Vermont 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 Vermont
Vermont has a growing page for 752 plants — a rotating sample of the rest of the shelf.
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