Frost dates · USDA zone 7b
Frost dates for Smyrna, TN
Smyrna, TN sees its last 32 °F night of spring around April 13 and its first of fall around October 21 — a 189-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Mar 31 | Nov 2 |
| Median — 1 year in 2 | Apr 13 | Oct 21 |
| 1 year in 10 | May 4 | Oct 8 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 189 days median, at least 167 in 9 years of 10, at least 209 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Apr 1 and first of Oct 30.
Smyrna planting calendar, 2027
Every row runs from the median last frost (Apr 13) and median first frost (Oct 21) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Jan 19 | Mar 16 | Jul 4 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Apr 13 | May 13 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Mar 30 | Mar 30 | May 14 | 45 from sow |
| Genovese BasilGenovese | Mar 16 | Apr 27 | Jun 26 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Feb 16 | Apr 20 | Jul 4 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Feb 2 | Apr 27 | Jul 31 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Feb 16 | Apr 20 | Jul 4 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Feb 16 | Apr 20 | Jul 9 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Feb 16 | Apr 20 | Jul 9 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Mar 30 | Mar 30 | Jun 8 | 70 from sow |
| TomatilloToma Verde | Mar 2 | Apr 20 | Jun 29 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Mar 2 | Apr 20 | Jul 4 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Mar 2 | Apr 20 | Jul 9 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Smyrna grow?
Each sauce, scheduled for a Smyrna container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Smyrna frost questions
When is the last frost in Smyrna, TN?
The median last 32 °F freeze at SMYRNA 6S, TN is April 13: half of years see a later one. One year in ten, a freeze still comes after May 4; nine years in ten, it comes after March 31. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Smyrna, TN?
The median first 32 °F freeze of fall is October 21. One year in ten it arrives before October 8; nine years in ten, before November 2.
How long is the growing season in Smyrna, TN?
189 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 167 days; one year in ten, at least 209 days.
What growing zone is Smyrna, TN?
USDA hardiness zone 7b, per the 2023 USDA Plant Hardiness Zone Map for ZIP 37167. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Smyrna, TN?
Start Roma VF (determinate paste) seeds indoors around Mar 2 and transplant around Apr 20, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for May 4. First ripe fruit lands around Jul 4.
When should I plant peppers in Smyrna, TN?
Sow jalapeño indoors on a heat mat around Feb 16; transplant no earlier than Apr 20, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Jul 4.
Nearby in Tennessee
- La Vergnelast frost Apr 13
- Murfreesborolast frost Apr 9
- Brentwoodlast frost Apr 15
- Mount Julietlast frost Apr 1
- Franklinlast frost Apr 15
- Lebanonlast frost Apr 10
All Tennessee frost dates → · How frost-date math drives a sowing calendar →