USDA Hardiness Zone 7b
Frost Dates for 37178 — Tennessee Ridge, Tennessee
NOAA 1991–2020 normals from Tennessee Ridge, TN (722 ft), under a mile west.
Updated
In Tennessee Ridge, the last spring frost (32°F) is around April 7 in half of years and has passed by April 24 in nine years out of ten. The first fall frost comes around November 3, as early as October 21 one year in ten, leaving a typical freeze-free season of 211 days (NOAA, Tennessee Ridge, TN).
- Last spring frost
- April 7
- First fall frost
- November 3
- Growing season
- 211 days
- Hardiness zone
- 7b
50% probability
50% probability
freeze-free, 50%
5 to 10°F (-15.0 to -12.2°C) coldest night
- First snow
- January 22
- Last snow
- February 11
- Winters with snow
- 86%
- Snow per year
- 3.8"
median, 1991–2020
median, 1991–2020
19 of 22 observed
NOAA normal
Frost risk by date in Tennessee Ridge
Half of springs at Tennessee Ridge, TN see their last 32°F night by April 7; only one in ten is past it by March 24, and one in ten still has one after April 24. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 19 20%, and after April 24 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 34% of the 144 Tennessee stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 3 in half of years, as early as October 21 one year in ten, and holds off past November 18 one year in ten. A hard freeze of 28°F follows 11 days later, around November 14; in spring the one-in-ten date for 28°F is April 18, 6 days before the 32°F one. The freeze-free season lasts 211 days in a typical year, longer than at 74% of the 144 Tennessee stations; it reaches 234 days one year in ten and falls short of 188 one year in ten. On average 84 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 12 days longer, to about April 19, and return around October 24. Severe cold of 16°F or below comes in 98% of winters, usually between December 19 and February 19.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 4 | Apr 9 | Apr 12 | Apr 15 | Apr 19 | Apr 22 | Apr 26 | Apr 30 | May 3 |
| 32°F | Mar 24 | Mar 29 | Apr 1 | Apr 4 | Apr 7 | Apr 10 | Apr 14 | Apr 19 | Apr 24 |
| 28°F | Mar 8 | Mar 16 | Mar 20 | Mar 24 | Mar 28 | Mar 31 | Apr 3 | Apr 8 | Apr 18 |
| 24°F | Feb 25 | Mar 3 | Mar 6 | Mar 11 | Mar 15 | Mar 19 | Mar 23 | Mar 29 | Apr 7 |
| 20°F | Feb 7 | Feb 16 | Feb 23 | Feb 28 | Mar 4 | Mar 8 | Mar 12 | Mar 17 | Mar 22 |
| 16°F98% of yrs | Jan 24 | Feb 1 | Feb 7 | Feb 13 | Feb 19 | Feb 25 | Mar 1 | Mar 6 | Mar 13 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 16 | Oct 19 | Oct 22 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 5 |
| 32°F | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 12 | Nov 18 |
| 28°F | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 14 | Nov 17 | Nov 21 | Nov 26 | Dec 1 |
| 24°F | Nov 7 | Nov 12 | Nov 17 | Nov 21 | Nov 25 | Nov 29 | Dec 1 | Dec 6 | Dec 12 |
| 20°F | Nov 16 | Nov 23 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 15 | Dec 21 | Dec 28 |
| 16°F98% of yrs | Nov 27 | Dec 3 | Dec 8 | Dec 12 | Dec 19 | Dec 24 | Dec 29 | Jan 3 | Jan 14 |
Freeze probabilities 1991–2020 at Tennessee Ridge, TN, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 37178 →Compare Tennessee Ridge with another place →
Weather by month in Tennessee Ridge
July is the warmest month at Tennessee Ridge, TN, averaging 89°F by day and 68°F at night; January is the coldest at 47°F and 26°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 70% of years.
Warmth for growing adds up to 4,538 growing degree days a year (base 50°F), more than at 58% of the 144 Tennessee stations. 38% of them (1,710) have built up by the end of June, and July adds the most, 880. Precipitation totals 54.7 inches a year, most in March (6.0") and least in September (3.0"); May to September bring 36% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 47 | 26 | 4.0 | 100% | 23 | 18 |
| Feb | 51 | 29 | 4.6 | 100% | 19 | 30 |
| Mar | 61 | 36 | 6.0 | 98% | 11 | 108 |
| Apr | 71 | 46 | 6.0 | 70% | 2 | 280 |
| May | 78 | 56 | 5.2 | 4% | <1 | 531 |
| Jun | 86 | 64 | 4.0 | 0% | 0 | 742 |
| Jul | 89 | 68 | 4.0 | 0% | 0 | 880 |
| Aug | 89 | 67 | 3.6 | 0% | 0 | 857 |
| Sep | 83 | 60 | 3.0 | 0% | 0 | 630 |
| Oct | 72 | 48 | 4.7 | 38% | 1 | 333 |
| Nov | 59 | 38 | 4.7 | 99% | 9 | 98 |
| Dec | 50 | 30 | 4.9 | 100% | 19 | 29 |
Monthly normals 1991–2020 at Tennessee Ridge, TN (722 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Dover 1 W, TN, 12 miles northwest of Tennessee Ridge and 247 feet lower, has a last frost 3 days earlier (April 4), a first frost 3 days earlier (October 31), a season 1 day shorter.
When it snows in Tennessee Ridge, Tennessee
The first measurable snow (0.1 inch or more) in Tennessee Ridge usually arrives around January 22, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Dover 1 W, TN, 11.9 miles away: half of years saw snow earlier, half later. Snow fell in 86% of those winters. The last 32°F night of spring typically comes 55 days after the last snow.
Planting calendar for 37178
| When | What to do |
|---|---|
| January 27 – February 10 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 10 – February 24 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 10 – March 24 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 7 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 11 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 20 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 3 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 37178 is under a mile from Tennessee Ridge, TN, which stands at 722 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 37061 (Erin). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37178 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Tennessee →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.