Conditional — Some Areas
wormwood (zones 4-9) has limited zone overlap with Wyoming (3a-5b). Only zones 4-5 in the state are suitable.
Your yard isn't the whole zone.
Wyoming spans zones 3a-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 wormwood against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Wormwood Needs
- USDA Zones: 4-9
- Soil pH: 4.8 - 8.2
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 90+
Wyoming Has
- USDA Zones: 3a-5b
- Last Frost: May 10 - Jun 15
- First Frost: Aug 25 - Sep 25
- Annual Rainfall: 6-20 inches
- Common Soils: Sandy loam, Clay, Alkaline
Plant Zone Range (zones 4-9)
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 Wormwood in Wyoming
The frost window
Across Wyoming, the last spring frost clears between May 10 and Jun 15, and the first fall frost lands between Aug 25 and Sep 25 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 71-day window you can count on — up to 138 days on a mild site in a kind year.
Establishment timing
As a long-lived plant, wormwood 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
Wormwood wants 90+ frost-free days; a typical Wyoming site sees ~170 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Wormwood needs ~800 GDD (base 50°F) to ripen. The state median runs ~2700 GDD (USDA NRCS county aggregates), so Wyoming's typical season clears that easily.
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
Wormwood likes near-neutral soil (pH 4.8-8.2). That's the common-ground band across Wyoming's sandy loam and clay — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Wyoming 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. Wyoming soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Wormwood in Wyoming — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 4-9 (USDA PLANTS Database)
- State Zones: 3a-5b (USDA ARS PHZM 2023)
- Growing Season: May 10 - Jun 15 to Aug 25 - Sep 25 (NOAA Climate Normals)
- Days to Maturity: 120 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Wyoming growers also need to think about:
Extremely short growing season (60-90 frost-free days)
At 60-90 frost-free days, a greenhouse or high tunnel isn't optional equipment — it's where the season actually happens.
Very low rainfall requires irrigation
Drip irrigation under mulch makes scarce water go the distance — build the system before the first bed.
Persistent high winds desiccate and damage plants
Windbreaks first, plants second — a sheltered bed loses a fraction of the moisture an exposed one does.
Wyoming Cooperative Extension
For Wyoming-specific cultivar recommendations, planting calendars, and pest pressure for wormwood, the canonical source is University of Wyoming Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Wormwood native to Wyoming?
No — the USDA PLANTS Database lists Wormwood as introduced rather than native in the Lower 48, so it is not part of Wyoming's native flora. It grows here as a garden plant; pairing it with a few Wyoming natives keeps local pollinators fed too.
Looking for plants that belong here? The Wyoming 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 Wormwood in Wyoming
When can I plant Wormwood in Wyoming?
Wyoming's last spring frost clears between May 10 and Jun 15, and the first fall frost lands between Aug 25 and Sep 25 (NOAA Climate Normals 1991-2020). Wormwood 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 Wormwood grown in across Wyoming?
Wyoming spans USDA hardiness zones 3a-5b (USDA ARS PHZM 2023). Wormwood 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 Wyoming site have?
A typical Wyoming site sees ~170 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Wormwood 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 Wormwood native to Wyoming?
No — the USDA PLANTS Database lists Wormwood as introduced rather than native in the Lower 48, so it is not part of Wyoming's native flora. It grows here as a garden plant; pairing it with a few Wyoming natives keeps local pollinators fed too.
How should I amend the soil for Wormwood in Wyoming?
Wormwood prefers pH 4.8-8.2 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Wyoming soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Wormwood actually grow on my specific land in Wyoming?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores wormwood 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 Wyoming
State-level data is a sketch. Your Growable Ground report scores wormwood 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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