Conditional — Some Areas
black-eyed Susan (zones 3-7) has limited zone overlap with Oklahoma (6b-8a). Only zones 6-7 in the state are suitable.
Your yard isn't the whole zone.
Oklahoma spans zones 6b-8a, but your yard has its own microclimate — slope, trees, and low spots shift frost and sun across a single parcel. Enter your address and we'll score black eyed susan against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Zone Comparison
Black Eyed Susan Needs
- USDA Zones: 3-7
- Soil pH: 5.5 - 8
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 0+
Oklahoma Has
- USDA Zones: 6b-8a
- Last Frost: Mar 20 - Apr 15
- First Frost: Oct 15 - Nov 5
- Annual Rainfall: 15-56 inches
- Common Soils: Red clay, Sandy loam, Prairie loam
Plant Zone Range (zones 3-7)
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 Black Eyed Susan in Oklahoma
The frost window
Across Oklahoma, the last spring frost clears between Mar 20 and Apr 15, and the first fall frost lands between Oct 15 and Nov 5 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 183-day window you can count on — up to 230 days on a mild site in a kind year.
Frost tenderness
Black Eyed Susan is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 120 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 63 days to spare even in Oklahoma's tightest frost scenario — room for a later start or a second sowing.
Timing tuned to sub-state frost dates — Cimarron County, not the statewide average.
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
Black Eyed Susan wants 0+ frost-free days; a typical Oklahoma site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Black Eyed Susan needs ~1000 GDD (base 50°F) to ripen. The state median runs ~4200 GDD (USDA NRCS county aggregates), so Oklahoma'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
Black Eyed Susan likes near-neutral soil (pH 5.5-8). That's the common-ground band across Oklahoma's red clay and sandy loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Oklahoma site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
Oklahoma's soils run mostly silt loam, but SSURGO maps the series, texture, and drainage under your exact parcel — that map unit, not the state average, decides how black eyed susan performs.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Oklahoma soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Black Eyed Susan in Oklahoma — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 3-7 (USDA PLANTS Database)
- State Zones: 6b-8a (USDA ARS PHZM 2023)
- Growing Season: Mar 20 - Apr 15 to Oct 15 - Nov 5 (NOAA Climate Normals)
- Days to Maturity: 120 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Oklahoma growers also need to think about:
Extreme weather variability (tornadoes, ice storms, drought)
Flexible beats fortified here: row covers staged, storm-tough perennials, and quick-replant annual beds.
Red clay soils drain poorly in central OK
A raised bed ends the standing-water fight in a weekend, and fall compost keeps opening the clay below.
Low western rainfall requires irrigation
Western plots run on drip and mulch — plan the water before the planting and the dry years lose their teeth.
Growing black eyed susan here specifically
Black Eyed Susan sends medium roots and rates to zones 3–7, but much of Oklahoma sits on slow-draining, restrictive ground (SSURGO hydrologic group D) that forks and stunts them.
Loosen a deep, stone-free bed for black eyed susan and break any compacted or hardpan layer before planting. How to handle it →
Timing shifts within Oklahoma
Oklahoma isn't one climate. In Cimarron County, the last hard freeze (28°F) holds until about Mar 24 — roughly 34 days later than the recorded state median — so plant black eyed susan to your county's window, not the statewide date.
County last-freeze dates: NOAA/PRISM Climate Normals 1991-2020, 28°F threshold (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Black Eyed Susan draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Recommended Black Eyed Susan Varieties for Oklahoma
Oklahoma publishes no state variety trial for black eyed susan, so we won't invent a "best for Oklahoma" list. Choose types rated to your USDA hardiness zone (6b-8a), and confirm winter survival and drainage against your own parcel.
Oklahoma Cooperative Extension
For Oklahoma-specific cultivar recommendations, planting calendars, and pest pressure for black eyed susan, the canonical source is Oklahoma State University Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Black Eyed Susan native to Oklahoma?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Black Eyed Susan as native to Oklahoma. 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 Black Eyed Susan in Oklahoma
When can I plant Black Eyed Susan in Oklahoma?
Oklahoma's last spring frost clears between Mar 20 and Apr 15, and the first fall frost lands between Oct 15 and Nov 5 (NOAA Climate Normals 1991-2020). Black Eyed Susan is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Black Eyed Susan mature before first frost in Oklahoma?
Yes — Black Eyed Susan matures in 120 days (USDA PLANTS Database), and Oklahoma's dependable frost-free window runs 183 days (NOAA Climate Normals 1991-2020), leaving 63 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Black Eyed Susan grown in across Oklahoma?
Oklahoma spans USDA hardiness zones 6b-8a (USDA ARS PHZM 2023). Black Eyed Susan carries a range of zones 3-7, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Oklahoma site have?
A typical Oklahoma site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Black Eyed Susan needs 0+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Cimarron, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Black Eyed Susan native to Oklahoma?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Black Eyed Susan as native to Oklahoma. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Black Eyed Susan in Oklahoma?
Black Eyed Susan prefers pH 5.5-8 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Oklahoma soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Black Eyed Susan actually grow on my specific land in Oklahoma?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores black eyed susan 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 Oklahoma
State-level data is a sketch. Your Growable Ground report scores black eyed susan 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.
25+ data sources analyzed in seconds
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →