Yes — Strong Match
Ethiopian mustard is grown in zones 4-10, which covers every zone Vermont contains (4a-6a). Whether the season is long enough is the question that remains.
Ethiopian Mustard in Vermont — the short answer
Ethiopian Mustard in Vermont: grown in zones 4–10, full sun, against a state median of ~163 frost-free days.
- Plant zones
- Grown as an annual — see the growing season
- Growing season, not a hardiness zone
- 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
- Days to maturity
- 90 days
- Growable Ground Plant Database
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.
Ethiopian Mustard is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical Vermont site runs ~163 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score ethiopian mustard against your land's actual frost dates, sun, and soil.
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Vermont is not one climate
A single Vermont answer averages 14 counties whose growing seasons are 44 days apart — from 146 frost-free days in Essex County to 190 in Grand Isle County. Which end of that your land sits nearer changes what ethiopian mustard can finish before the first hard freeze.
The middle half of 14 counties runs 158–173 days, with a median of 161 days — a 44-day span end to end.
Measured across 14 Vermont counties. NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze. 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
Even within Vermont's zones 4a-6a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for ethiopian mustard (USDA PHZM 2023):
Zone Comparison
Ethiopian Mustard Needs
- USDA Zones: 4-10
- Sun: Full SunWe haven't confirmed this against a published source yet.
- Mature size: 4 ft tallWe haven't confirmed this against a published source yet.
- Drought tolerance: MediumWe 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 4-10)
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 Ethiopian Mustard 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.
Frost hardiness
Ethiopian Mustard takes cold down to about 25°F before a freeze kills it, so you can plant on the early side of Vermont's window — even a few weeks before the final hard freeze. That is the point where cold damages growing tissue, not a winter-survival floor — an established perennial comes through far colder while dormant, which is what its hardiness zone tells you. We haven't confirmed this against a published source yet.
When to start the seed
Ethiopian Mustard is direct-sown where it grows rather than started under cover, so there is no seed-tray head start to bank — Vermont's dates above are the whole calendar for it. That makes the last-freeze date the binding constraint, and a warmer pocket of your own yard is worth more to this crop than it is to a transplanted one.
Days to maturity vs. the window
At 90 days to maturity (Growable Ground Plant Database), counting from the last hard freeze it ripens with 68 days to spare even in Vermont's tightest freeze scenario — room for a later start or a second sowing.
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
Ethiopian Mustard is grown in zones 4–10, which covers every zone Vermont contains (4a-6a). It is grown as a summer crop, so season length decides it here. Vermont's typical season runs ~163 frost-free days against the ~90 ethiopian mustard needs.
Days to maturity
Ethiopian Mustard matures in ~90 days. We haven't confirmed this against a published source yet. A typical Vermont site has ~163 frost-free days, so plenty of room for a second succession.
Growing degree days
Ethiopian Mustard needs ~1400 GDD (base 50°F) to ripen. We haven't confirmed this against a published source yet. The state median runs ~1746 GDD (from PRISM 1991-2020 climate normals), so Vermont's typical season clears that easily.
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
Ethiopian Mustard tolerates a wide pH range (pH 5-8.5) — 3.5 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 8 — 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). 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.
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 Ethiopian Mustard in Vermont
The zone range tells you where ethiopian mustard is grown — 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 ethiopian mustard — is covered on the Vermont growing guide.
Timing shifts within Vermont
Ethiopian Mustard needs about 90 days of frost-free season from planting to harvest. Even Essex County — Vermont’s shortest season at 146 frost-free days — clears that by 56 days, so season length isn’t the constraint anywhere in Vermont. What varies is your own parcel.
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"). Ethiopian Mustard's 90-day requirement: USDA PLANTS / Growable Ground plant database (days to maturity). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Ethiopian Mustard draws honeybees and native bees (moderate value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, ethiopian mustard can only work that bloom inside Vermont's frost window — roughly 163 days, opening after the last 28°F freeze (Apr 27 - May 5) and closing at the first (Oct 10 - Oct 17), per NOAA Regional Climate Centers ACIS, 1991-2020. Pollinator value: We haven't confirmed this against a published source yet.
Vermont Cooperative Extension
For Vermont-specific cultivar recommendations, planting calendars, and pest pressure for ethiopian mustard, the canonical source is UVM Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Ethiopian Mustard native to Vermont?
No — the USDA PLANTS Database lists Ethiopian Mustard as introduced rather than native in the Lower 48, so it is not part of Vermont's native flora. It grows here as a garden plant; pairing it with a few Vermont natives keeps local pollinators fed too.
Looking for plants that belong here? The Vermont growing guide lists plants that USDA PLANTS records growing in Vermont 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 Ethiopian Mustard in Vermont
When can I plant Ethiopian Mustard 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). Time outdoor planting to after the last hard freeze for your specific site — a further two to three weeks for anything tender — and count back from those dates for transplant scheduling.
Can Ethiopian Mustard mature before first frost in Vermont?
Yes — Ethiopian Mustard matures in 90 days (Growable Ground Plant Database), and Vermont's dependable hard-freeze-free window runs 158 days (NOAA Regional Climate Centers ACIS, 1991-2020), leaving 68 days of margin. Plant once the last hard freeze has passed — two to three weeks later for anything tender — and it ripens ahead of the first fall freeze.
What hardiness zone is Ethiopian Mustard grown in across Vermont?
Vermont spans USDA hardiness zones 4a-6a (USDA ARS PHZM 2023). Ethiopian Mustard 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 Vermont site have?
A typical Vermont site sees ~163 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Ethiopian Mustard 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.
Is Ethiopian Mustard native to Vermont?
No — the USDA PLANTS Database lists Ethiopian Mustard as introduced rather than native in the Lower 48, so it is not part of Vermont's native flora. It grows here as a garden plant; pairing it with a few Vermont natives keeps local pollinators fed too.
How should I amend the soil for Ethiopian Mustard in Vermont?
Ethiopian Mustard tolerates pH 5-8.5 and well (dry spells) drainage (FAO ECOCROP). That is a 3.5-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 Ethiopian Mustard actually grow on my specific land in Vermont?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores ethiopian mustard 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 ethiopian mustard against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Vermont ethiopian mustard 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 ethiopian mustard average
Explore More
Growing guides for ethiopian mustard
Explore Vermont county by county
Vermont carries 14 counties with their own USDA zone — a sample of the growing pages for ethiopian mustard there:
Where else ethiopian mustard grows
Ethiopian Mustard'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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