Generally — Most Areas
oregano (zones 4-9) partially overlaps with Missouri (5b-7a). It can grow in zones 5-7 within the state.
Your yard isn't the whole zone.
Missouri spans zones 5b-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 oregano against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Oregano Needs
- USDA Zones: 4-9
- Soil pH: 4.5 - 8.7
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 180+
Missouri Has
- USDA Zones: 5b-7a
- Last Frost: Apr 5 - Apr 25
- First Frost: Oct 5 - Oct 30
- Annual Rainfall: 34-50 inches
- Common Soils: Silt loam, Clay loam, Loess
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 Oregano in Missouri
The frost window
Across Missouri, the last spring frost clears between Apr 5 and Apr 25, and the first fall frost lands between Oct 5 and Oct 30 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 163-day window you can count on — up to 208 days on a mild site in a kind year.
Frost tenderness
Oregano is frost-tender — its listed minimum temperature is 39.2°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Establishment timing
As a long-lived plant, oregano 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
Oregano wants 180+ frost-free days; a typical Missouri site sees ~190 (NOAA Climate Normals). That leaves tight; use transplants and pick early-maturing cultivars.
Growing degree days
Oregano needs ~1800 GDD (base 50°F) to ripen. The state median runs ~3850 GDD (USDA NRCS county aggregates), so Missouri'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
Oregano likes near-neutral soil (pH 4.5-8.7). That's the common-ground band across Missouri's silt loam and clay loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Missouri 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. Missouri soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Oregano in Missouri — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 4-9 (USDA PLANTS Database)
- State Zones: 5b-7a (USDA ARS PHZM 2023)
- Growing Season: Apr 5 - Apr 25 to Oct 5 - Oct 30 (NOAA Climate Normals)
- Days to Maturity: 80 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Missouri growers also need to think about:
Highly variable weather with late frosts and early heat
Let your local frost normals call the plantings — Missouri springs punish the calendar-planters and reward the patient.
Heavy clay soils in many regions
Raised beds solve clay drainage the first weekend — and yearly compost turns the ground under them into loam.
Ozark soils are thin and rocky
One soil test shows what thin Ozark ground actually holds — then build up with compost or beds where the depth runs out.
Pollinator + Wildlife Value
Oregano draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Deer pressure is meaningful across much of Missouri; oregano is listed as deer-resistant (USDA PLANTS Database), which makes it a safer pick for unfenced sites. Our deer & wildlife guide carries the full deer-resistant list and how to protect the rest.
Missouri Cooperative Extension
For Missouri-specific cultivar recommendations, planting calendars, and pest pressure for oregano, the canonical source is MU Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Oregano native to Missouri?
No — the USDA PLANTS Database lists Oregano as introduced rather than native in the Lower 48, so it is not part of Missouri's native flora. It grows here as a garden plant; pairing it with a few Missouri natives keeps local pollinators fed too.
Looking for plants that belong here? The Missouri 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 Oregano in Missouri
When can I plant Oregano in Missouri?
Missouri's last spring frost clears between Apr 5 and Apr 25, and the first fall frost lands between Oct 5 and Oct 30 (NOAA Climate Normals 1991-2020). Oregano 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 Oregano grown in across Missouri?
Missouri spans USDA hardiness zones 5b-7a (USDA ARS PHZM 2023). Oregano 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 Missouri site have?
A typical Missouri site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Oregano needs 180+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Oregano native to Missouri?
No — the USDA PLANTS Database lists Oregano as introduced rather than native in the Lower 48, so it is not part of Missouri's native flora. It grows here as a garden plant; pairing it with a few Missouri natives keeps local pollinators fed too.
How should I amend the soil for Oregano in Missouri?
Oregano prefers pH 4.5-8.7 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Missouri soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Oregano actually grow on my specific land in Missouri?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores oregano 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 Missouri
State-level data is a sketch. Your Growable Ground report scores oregano 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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