USDA Hardiness Zone 7a
Frost Dates for 37032 — Cedar Hill, Tennessee
NOAA 1991–2020 normals from Springfield Exp Stn, TN (745 ft), 11 miles east.
Updated
In Cedar Hill, the last spring frost (32°F) is around April 9 in half of years and has passed by April 28 in nine years out of ten. The first fall frost comes around October 28, as early as October 14 one year in ten, leaving a typical freeze-free season of 201 days (NOAA, Springfield Exp Stn, TN).
- Last spring frost
- April 9
- First fall frost
- October 28
- Growing season
- 201 days
- Hardiness zone
- 7a
50% probability
50% probability
freeze-free, 50%
0 to 5°F (-17.8 to -15.0°C) coldest night
- First snow
- January 8
- Last snow
- February 20
- Winters with snow
- 95%
- Snow per year
- 5.8"
median, 1991–2020
median, 1991–2020
21 of 22 observed
NOAA normal
Frost risk by date in Cedar Hill
Half of springs at Springfield Exp Stn, TN see their last 32°F night by April 9; only one in ten is past it by March 22, and one in ten still has one after April 28. Planting tender crops after April 16 leaves a 30% risk of a frost on them, after April 22 20%, and after April 28 10%. The 19 days between the even-odds date and the one-in-ten date is wider than at 84% of the 144 Tennessee stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 28 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 9 days later, around November 6; in spring the one-in-ten date for 28°F is April 14, 14 days before the 32°F one. The freeze-free season lasts 201 days in a typical year, shorter than at 58% of the 144 Tennessee stations; it reaches 224 days one year in ten and falls short of 180 one year in ten. On average 91 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 22, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 18 and February 16.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 4 | Apr 11 | Apr 15 | Apr 18 | Apr 22 | Apr 26 | Apr 30 | May 3 | May 8 |
| 32°F | Mar 22 | Mar 29 | Apr 1 | Apr 5 | Apr 9 | Apr 13 | Apr 16 | Apr 22 | Apr 28 |
| 28°F | Mar 8 | Mar 14 | Mar 19 | Mar 24 | Mar 28 | Mar 31 | Apr 3 | Apr 8 | Apr 14 |
| 24°F | Feb 23 | Mar 1 | Mar 6 | Mar 11 | Mar 15 | Mar 19 | Mar 25 | Mar 30 | Apr 4 |
| 20°F | Feb 7 | Feb 15 | Feb 21 | Feb 27 | Mar 2 | Mar 7 | Mar 13 | Mar 17 | Mar 25 |
| 16°F | Jan 21 | Jan 31 | Feb 6 | Feb 11 | Feb 16 | Feb 23 | Feb 28 | Mar 5 | Mar 14 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 5 | Oct 10 | Oct 14 | Oct 16 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 30 |
| 32°F | Oct 14 | Oct 19 | Oct 23 | Oct 25 | Oct 28 | Oct 30 | Nov 1 | Nov 4 | Nov 10 |
| 28°F | Oct 23 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 19 | Nov 26 |
| 24°F | Nov 2 | Nov 7 | Nov 11 | Nov 14 | Nov 19 | Nov 23 | Nov 28 | Dec 3 | Dec 10 |
| 20°F | Nov 11 | Nov 17 | Nov 23 | Nov 28 | Dec 2 | Dec 6 | Dec 11 | Dec 18 | Dec 25 |
| 16°F | Nov 24 | Dec 1 | Dec 5 | Dec 12 | Dec 18 | Dec 23 | Dec 27 | Jan 1 | Jan 11 |
Freeze probabilities 1991–2020 at Springfield Exp Stn, 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 37032 →Compare Cedar Hill with another place →
Weather by month in Cedar Hill
July is the warmest month at Springfield Exp Stn, TN, averaging 89°F by day and 68°F at night; January is the coldest at 45°F and 27°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 69% of years.
Warmth for growing adds up to 4,509 growing degree days a year (base 50°F), more than at 56% of the 144 Tennessee stations. 38% of them (1,709) have built up by the end of June, and July adds the most, 880. Precipitation totals 53.4 inches a year, most in May (5.6") and least in August (3.7"); May to September bring 41% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 45 | 27 | 4.3 | 100% | 23 | 21 |
| Feb | 50 | 30 | 4.5 | 100% | 19 | 31 |
| Mar | 59 | 37 | 4.8 | 98% | 12 | 111 |
| Apr | 69 | 47 | 5.3 | 69% | 3 | 276 |
| May | 77 | 57 | 5.6 | 7% | <1 | 524 |
| Jun | 85 | 65 | 4.3 | 0% | 0 | 745 |
| Jul | 89 | 68 | 4.4 | 0% | 0 | 880 |
| Aug | 88 | 66 | 3.7 | 0% | 0 | 843 |
| Sep | 82 | 60 | 3.8 | 0% | 0 | 627 |
| Oct | 71 | 48 | 4.2 | 68% | 3 | 316 |
| Nov | 59 | 38 | 3.8 | 99% | 12 | 102 |
| Dec | 49 | 31 | 4.7 | 100% | 19 | 32 |
Monthly normals 1991–2020 at Springfield Exp Stn, TN (745 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, Goodlettsville 7WNW, TN, 17 miles southeast of Cedar Hill, has a last frost 2 days earlier (April 7), the same first-frost date, a season 3 days longer.
When it snows in Cedar Hill, Tennessee
The first measurable snow (0.1 inch or more) in Cedar Hill usually arrives around January 8, and the last of the season around February 20. Those are the middle dates across the winters of 1991–2020 at Springfield Exp Stn, TN, 10.8 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 48 days after the last snow.
Planting calendar for 37032
| When | What to do |
|---|---|
| January 29 – February 12 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 12 – February 26 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 12 – March 26 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 9 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 5 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 14 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 28 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 37032 is 11 miles from Springfield Exp Stn, TN, which stands at 745 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 37172 (Springfield). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37032 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°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.