When is the last frost in Smyrna, TN?

The average last spring frost (50% probability of 32°F) in Smyrna is around April 13, based on NOAA/NCEI 1991–2020 normals at the Smyrna 6s, TN station (3.9 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Smyrna?

The average first fall frost in Smyrna, TN is around October 21, giving roughly a 189-day frost-free growing season.

What planting zone is Smyrna, TN?

Smyrna is in USDA plant hardiness zone 7b (average annual extreme minimum temperature 5 to 10°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Smyrna?

In Smyrna, TN the warmest month is July (avg high 89.2°F) and the coldest is January (avg low 27.5°F). It averages about 55.9″ of precipitation a year and 2.2″ of snow.

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Smyrna, TN Planting Calendar & Frost Dates

USDA hardiness zone 7b · ZIP 37167 · elevation 163′ · NOAA & USDA data

Smyrna is in USDA hardiness zone 7b (winters can dip to 5 to 10°F), with a growing season of about 189 days between the average last spring frost (April 13) and first fall frost (October 21). The warmest month is July (avg high 89.2°F); the coldest is January (avg low 27.5°F). It averages 55.9″ of precipitation a year and 2.2″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 5 to 10°F

Last spring frost

April 13

avg (50% prob, 32°F)

First fall frost

October 21

avg (50% prob, 32°F)

Growing season

189 days

frost-free window

Warmest month

July

avg high 89.2°F

Month-by-month typical weather in Smyrna

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Murfreesboro 5 N, TN (9.3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	47.9	27.5	37.7	4.7	0.8
February	52.5	30.4	41.4	4.9	0.7
March	61.1	37.2	49.1	5.3	0.4
April	70.9	45.7	58.3	4.8	0
May	79	55.3	67.2	4.9	0
June	86.2	64.4	75.3	5.7	0
July	89.2	68.4	78.8	5	0
August	89	66.6	77.8	3.6	0
September	83.8	59.3	71.6	4	0
October	73.1	46.7	59.9	3.5	0
November	60.9	36.8	48.9	4.1	0
December	51.3	31	41.2	5.5	0.3

What to plant when in Smyrna

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 2 · Transplant out: April 20
Peppers	warm	Start seeds indoors: February 16 · Transplant out: April 27
Cucumbers	warm	Direct sow: April 20
Zucchini / squash	warm	Direct sow: April 20
Bush beans	warm	Direct sow: April 20
Sweet corn	warm	Direct sow: April 20
Basil	warm	Transplant out: April 20
Peas	cool	Sow (spring): March 9 · Sow (fall): August 26
Spinach	cool	Sow (spring): March 2 · Sow (fall): August 26
Lettuce	cool	Sow (spring): March 16 · Sow (fall): August 26
Kale	cool	Transplant (spring): March 23 · Sow (fall): August 12
Broccoli	cool	Transplant (spring): March 30
Carrots	cool	Sow (spring): March 23 · Sow (fall): August 12
Onions	cool	Transplant (spring): March 16
Potatoes	cool	Plant seed potatoes: March 30
Radishes	cool	Sow (spring): March 16 · Sow (fall): September 9

Dates are computed from Smyrna's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Tennessee

Brentwood, TN Murfreesboro, TN Nashville, TN Franklin, TN Hendersonville, TN Clarksville, TN Chattanooga, TN Cleveland, TN

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Smyrna 6s, TN, 3.9 mi (confidence: high). Monthly weather normals: Murfreesboro 5 N, TN, 9.3 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.