USDA Hardiness Zone 7b
Frost Dates for 38321 — Cedar Grove, Tennessee
NOAA 1991–2020 normals from Huntingdon Wtp, TN (440 ft), 13 miles northeast.
Updated
In Cedar Grove, the last spring frost (32°F) is around April 2 in half of years and has passed by April 18 in nine years out of ten. The first fall frost comes around October 31, as early as October 19 one year in ten, leaving a typical freeze-free season of 211 days (NOAA, Huntingdon Wtp, TN).
- Last spring frost
- April 2
- First fall frost
- October 31
- 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 20
- Last snow
- February 9
- Winters with snow
- 89%
- Snow per year
- 3.3"
median, 1991–2020
median, 1991–2020
25 of 28 observed
NOAA normal
Frost risk by date in Cedar Grove
Half of springs at Huntingdon Wtp, TN see their last 32°F night by April 2; only one in ten is past it by March 16, and one in ten still has one after April 18. Planting tender crops after April 9 leaves a 30% risk of a frost on them, after April 13 20%, and after April 18 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 53% of the 144 Tennessee stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 31 in half of years, as early as October 19 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 9 days later, around November 9; in spring the one-in-ten date for 28°F is April 7, 11 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 191 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 13 days longer, to about April 15, and return around October 22. Severe cold of 16°F or below comes in 96% of winters, usually between December 28 and February 9.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 30 | Apr 4 | Apr 8 | Apr 12 | Apr 15 | Apr 18 | Apr 21 | Apr 24 | Apr 30 |
| 32°F | Mar 16 | Mar 22 | Mar 26 | Mar 31 | Apr 2 | Apr 5 | Apr 9 | Apr 13 | Apr 18 |
| 28°F | Mar 1 | Mar 8 | Mar 14 | Mar 18 | Mar 21 | Mar 24 | Mar 29 | Apr 2 | Apr 7 |
| 24°F | Feb 16 | Feb 24 | Feb 28 | Mar 3 | Mar 7 | Mar 12 | Mar 16 | Mar 20 | Mar 28 |
| 20°F | Jan 31 | Feb 9 | Feb 14 | Feb 20 | Feb 24 | Feb 28 | Mar 4 | Mar 10 | Mar 16 |
| 16°F96% of yrs | Jan 10 | Jan 23 | Jan 31 | Feb 5 | Feb 9 | Feb 15 | Feb 22 | Feb 27 | Mar 5 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 10 | Oct 14 | Oct 17 | Oct 20 | Oct 22 | Oct 24 | Oct 26 | Oct 29 | Nov 2 |
| 32°F | Oct 19 | Oct 23 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 13 |
| 28°F | Oct 28 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 20 | Nov 27 |
| 24°F | Nov 4 | Nov 9 | Nov 13 | Nov 17 | Nov 21 | Nov 26 | Dec 1 | Dec 4 | Dec 11 |
| 20°F | Nov 13 | Nov 20 | Nov 27 | Dec 1 | Dec 6 | Dec 12 | Dec 18 | Dec 25 | Jan 1 |
| 16°F96% of yrs | Nov 30 | Dec 8 | Dec 17 | Dec 23 | Dec 28 | Jan 1 | Jan 5 | Jan 12 | Jan 24 |
Freeze probabilities 1991–2020 at Huntingdon Wtp, 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 38321 →Compare Cedar Grove with another place →
Weather by month in Cedar Grove
July is the warmest month at Huntingdon Wtp, TN, averaging 89°F by day and 69°F at night; January is the coldest at 47°F and 28°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 55% of years.
Warmth for growing adds up to 4,698 growing degree days a year (base 50°F), more than at 74% of the 144 Tennessee stations. 39% of them (1,831) have built up by the end of June, and July adds the most, 907. Precipitation totals 56.1 inches a year, most in May (5.9") and least in September (3.5"); May to September bring 40% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 47 | 28 | 4.2 | 100% | 21 | 23 |
| Feb | 52 | 31 | 4.6 | 100% | 18 | 35 |
| Mar | 61 | 38 | 5.5 | 97% | 11 | 127 |
| Apr | 71 | 47 | 5.3 | 55% | 2 | 301 |
| May | 79 | 57 | 5.9 | 0% | 0 | 564 |
| Jun | 86 | 66 | 4.7 | 0% | 0 | 781 |
| Jul | 89 | 69 | 4.7 | 0% | 0 | 907 |
| Aug | 89 | 67 | 3.6 | 0% | 0 | 871 |
| Sep | 83 | 59 | 3.5 | 0% | 0 | 638 |
| Oct | 72 | 47 | 4.0 | 53% | 2 | 322 |
| Nov | 60 | 37 | 4.7 | 99% | 11 | 98 |
| Dec | 50 | 31 | 5.4 | 100% | 19 | 31 |
Monthly normals 1991–2020 at Huntingdon Wtp, TN (440 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, Milan Exp Stn, TN, 12 miles northwest of Cedar Grove, has a last frost 2 days later (April 4), a first frost 3 days earlier (October 28), a season 5 days shorter.
When it snows in Cedar Grove, Tennessee
The first measurable snow (0.1 inch or more) in Cedar Grove usually arrives around January 20, and the last of the season around February 9. Those are the middle dates across the winters of 1991–2020 at Huntingdon Wtp, TN, 12.5 miles away: half of years saw snow earlier, half later. Snow fell in 89% of those winters. The last 32°F night of spring typically comes 52 days after the last snow.
Planting calendar for 38321
| When | What to do |
|---|---|
| January 22 – February 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 5 – February 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 5 – March 19 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 2 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 8 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 17 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 31 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 38321 is 13 miles from Huntingdon Wtp, TN, which stands at 440 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 38201 (Mc Kenzie). The 2023 USDA Plant Hardiness Zone Map lists ZIP 38321 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.