Unlikely — Zone Mismatch
molasses grass (zones 9-13) does not overlap with Tennessee's zone range (6a-8a). Growing outdoors is unlikely without significant protection.
One zone short — what would close it
Molasses Grass is hardy to zone 9, and the warmest ground in Tennessee is zone 8 — 1 zone short. Planted in open ground it will not survive a Tennessee winter. To grow it here, grow molasses grass in a hoop house or unheated greenhouse — its modeled 1.5-zone lift covers this gap.
A hoop house or unheated greenhouse is the lift this needs. How a greenhouse changes what you can grow →
Zone math from 9-13 (plant) against 6-8 (Tennessee). Lift modeled by crop_engine.GREENHOUSE_ZONE_MODIFIER_BY_SUBTYPE['hoop_house'] (+1.5 zones) via api/fast_sections.py Unlock Engine v2.
Molasses Grass in Tennessee — the short answer
Molasses Grass in Tennessee: hardy in zones 9–13, full sun, against a state median of ~230 frost-free days.
- Plant zones
- 9-13
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Tennessee zones
- 6a-8a
- USDA PHZM 2023
- Frost window
- Mar 21 - Mar 29 – Nov 5 - Nov 12
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 193 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.
Tennessee spans zones 6a-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 molasses grass 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.
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Tennessee is not one climate
A single Tennessee answer averages 95 counties whose growing seasons are 73 days apart — from 193 frost-free days in Johnson County to 266 in Shelby County. Which end of that your land sits nearer changes what molasses grass can finish before the first hard freeze.
The middle half of 95 counties runs 221–235 days, with a median of 230 days — a 73-day span end to end.
Measured across 95 Tennessee 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 Molasses Grass Stands in Tennessee
Molasses Grass is rated for zones 9–13 — a cold floor USDA puts at 20 to 30°F. No Tennessee county sits inside it, so in open ground this is a grown-under-cover plant here rather than a bed plant — which is a statement about Tennessee winters, not about molasses grass.
Below the zone 9 floor
95 counties
- Carter County · zone 7a
- Cheatham County · zone 7a
- Claiborne County · zone 7a
3 of 95 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.
Zone Comparison
Molasses Grass Needs
- USDA Zones: 9-13
- Frost-Free Days: 120+
- Sun: Full Sun
Tennessee Has
- USDA Zones: 6a-8a
- Last Hard Freeze (28°F): Mar 21 - Mar 29
- First Hard Freeze (28°F): Nov 5 - Nov 12
- Annual Rainfall: 45-55 inches
- Common Soils: Silt loam, Clay loam, Limestone-derived
Plant Zone Range (zones 9-13)
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 Molasses Grass in Tennessee
The frost window
Across Tennessee, the last spring hard freeze (28°F) clears between Mar 21 and Mar 29, and the first fall hard freeze lands between Nov 5 and Nov 12 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 221-day window you can count on — up to 236 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.
When to start the seed
Molasses Grass is direct-sown where it grows rather than started under cover, so there is no seed-tray head start to bank — Tennessee'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.
Timing tuned to sub-state frost dates — Johnson County, not the statewide average.
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
The zone check says molasses grass does not survive a Tennessee winter in the ground. The season figures below measure a different question — whether it could finish a season here at all — and they only bear on Tennessee under protection.
Frost-free days
Molasses Grass wants 120+ frost-free days; a typical Tennessee site sees ~230 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
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
Molasses Grass tolerates a wide pH range (pH 4.3-8.4) — 4.1 units, acid ground through alkaline — so soil acidity is rarely what limits it in Tennessee. 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 and 7.5 — worth knowing before you decide whether a Tennessee soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Tennessee site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
Tennessee's soils run mostly silt loam, but SSURGO maps the series, texture, and drainage under your exact parcel. Molasses Grass needs about 7 inches of workable depth, so it is that horizon — not the surface — you are testing for. That map unit, not the state average, decides how molasses grass performs.
Check your parcel → Source: USDA NRCS SSURGO.
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. Tennessee soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Molasses Grass in Tennessee
Zone compatibility tells you about winter cold survival — but Tennessee growers also need to think about:
Heavy clay soils in the Nashville Basin
High humidity promotes disease in summer
Variable spring weather with late frost risk
Growing molasses grass here specifically
Tennessee's soils run mostly silt loam (Ultisols), and whether that suits molasses grass's pH 4.3–8.4 preference comes down to your exact parcel, not the statewide picture.
Pull your parcel's SSURGO map unit, test pH, and amend toward molasses grass's 4.3–8.4 target before planting. How to handle it →
What to actually do about these — and the constraints that apply to every Tennessee grower, not just molasses grass — is covered on the Tennessee growing guide.
Timing shifts within Tennessee
Tennessee isn't one climate. In Johnson County, the last hard freeze (28°F) holds until about Apr 14 — roughly 21 days later than the recorded state median — so plant molasses grass to your county's window, not the statewide date.
Molasses Grass needs about 120 days of frost-free season to complete its cycle. Even Johnson County — Tennessee’s shortest season at 193 frost-free days — clears that by 73 days, so season length isn’t the constraint anywhere in Tennessee. What varies is your own parcel.
Across Tennessee’s 95 counties the frost-free season runs from 193 days in Johnson County to 266 days in Shelby County — a spread of 73 days, which is why a single statewide planting date misleads. The median Tennessee county sees 230 frost-free days, leaving molasses grass about 110 days of slack on a typical parcel — room for a second sowing where the season runs long.
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"). Molasses Grass's 120-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Tennessee Cooperative Extension
For Tennessee-specific cultivar recommendations, planting calendars, and pest pressure for molasses grass, the canonical source is UT Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Molasses Grass native to Tennessee?
No — the USDA PLANTS Database lists Molasses Grass as introduced rather than native in the Lower 48, so it is not part of Tennessee's native flora. It grows here as a garden plant; pairing it with a few Tennessee natives keeps local pollinators fed too.
Looking for plants that belong here? The Tennessee 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 Molasses Grass in Tennessee
When can I plant Molasses Grass in Tennessee?
Tennessee's last spring hard freeze (28°F) clears between Mar 21 and Mar 29, and the first fall hard freeze lands between Nov 5 and Nov 12 (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.
What hardiness zone is Molasses Grass grown in across Tennessee?
Tennessee spans USDA hardiness zones 6a-8a (USDA ARS PHZM 2023). Molasses Grass carries a range of zones 9-13, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Tennessee site have?
A typical Tennessee site sees ~230 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Molasses Grass needs 120+ 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 Johnson, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Molasses Grass native to Tennessee?
No — the USDA PLANTS Database lists Molasses Grass as introduced rather than native in the Lower 48, so it is not part of Tennessee's native flora. It grows here as a garden plant; pairing it with a few Tennessee natives keeps local pollinators fed too.
How should I amend the soil for Molasses Grass in Tennessee?
Molasses Grass tolerates pH 4.3-8.4 and well (dry spells) drainage (FAO ECOCROP). That is a 4.1-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Tennessee site — amend for drainage and organic matter first.
Will Molasses Grass actually grow on my specific land in Tennessee?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores molasses grass 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 Tennessee
State-level data is a sketch. Your Growable Ground report scores molasses grass against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Tennessee molasses grass averages can't show:
We read public map data around Tennessee — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Tennessee molasses grass average
Explore More
Growing guides for molasses grass
Explore Tennessee county by county
Tennessee carries 95 counties with their own USDA zone — a sample of the growing pages for molasses grass there:
Where else molasses grass grows
Molasses Grass's zone band crosses state lines — these are the states closest to Tennessee 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 Tennessee
Tennessee has a growing page for 1,020 plants — a rotating sample of the rest of the shelf.
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 →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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