USDA Hardiness Zone 7b
Frost Dates for 37821 — Newport, Tennessee
NOAA 1991–2020 normals from Newport 1 NW, TN (1,036 ft), 1 miles north.
Updated
In Newport, the last spring frost (32°F) is around April 7 in half of years and has passed by April 23 in nine years out of ten. The first fall frost comes around October 29, as early as October 17 one year in ten, leaving a typical freeze-free season of 203 days (NOAA, Newport 1 NW, TN).
- Last spring frost
- April 7
- First fall frost
- October 29
- Growing season
- 203 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 14
- Last snow
- February 10
- Winters with snow
- 67%
- Snow per year
- 3.3"
median, 1991–2020
median, 1991–2020
20 of 30 observed
NOAA normal
Frost risk by date in Newport
Half of springs at Newport 1 NW, TN see their last 32°F night by April 7; only one in ten is past it by March 23, and one in ten still has one after April 23. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 18 20%, and after April 23 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 29 in half of years, as early as October 17 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 8 days later, around November 6; in spring the one-in-ten date for 28°F is April 12, 11 days before the 32°F one. The freeze-free season lasts 203 days in a typical year, shorter than at 52% of the 144 Tennessee stations; it reaches 222 days one year in ten and falls short of 184 one year in ten. On average 85 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 14 days longer, to about April 21, and return around October 21. Severe cold of 16°F or below comes in 98% of winters, usually between December 26 and February 5.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 5 | Apr 11 | Apr 15 | Apr 18 | Apr 21 | Apr 24 | Apr 27 | May 1 | May 6 |
| 32°F | Mar 23 | Mar 29 | Apr 1 | Apr 5 | Apr 7 | Apr 11 | Apr 14 | Apr 18 | Apr 23 |
| 28°F | Mar 9 | Mar 16 | Mar 19 | Mar 23 | Mar 27 | Mar 30 | Apr 2 | Apr 6 | Apr 12 |
| 24°F | Feb 20 | Feb 28 | Mar 5 | Mar 10 | Mar 14 | Mar 17 | Mar 21 | Mar 26 | Apr 2 |
| 20°F | Jan 31 | Feb 8 | Feb 14 | Feb 20 | Feb 26 | Mar 1 | Mar 7 | Mar 13 | Mar 22 |
| 16°F98% of yrs | Jan 14 | Jan 22 | Jan 29 | Feb 2 | Feb 5 | Feb 12 | Feb 19 | Feb 27 | Mar 7 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 9 | Oct 13 | Oct 16 | Oct 18 | Oct 21 | Oct 23 | Oct 26 | Oct 30 | Nov 2 |
| 32°F | Oct 17 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 5 | Nov 10 |
| 28°F | Oct 25 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 20 |
| 24°F | Nov 4 | Nov 8 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 26 | Nov 30 | Dec 5 |
| 20°F | Nov 13 | Nov 19 | Nov 24 | Nov 29 | Dec 2 | Dec 6 | Dec 12 | Dec 20 | Dec 29 |
| 16°F98% of yrs | Nov 28 | Dec 4 | Dec 11 | Dec 19 | Dec 26 | Dec 30 | Jan 3 | Jan 10 | Jan 20 |
Freeze probabilities 1991–2020 at Newport 1 NW, 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 37821 →Compare Newport with another place →
Frost risk through the year in Newport
In Newport, the spring curve drops under 10% on April 23 and the fall curve passes 10% on October 17, 177 days later; that gap is longer than at 55% of the 144 Tennessee stations with frost dates. The spring risk falls from 90% to 10% over 31 days (March 23 to April 23) and the fall risk climbs from 10% to 90% over 24 days (October 17 to November 10): the last frost moves more from year to year than the first. At Waterville 2, NC, 14 miles southeast, the same gap runs from April 23 to October 20, 3 days longer.
| Planted on | Another 32°F night | 28°F night |
|---|---|---|
| Mar 24 | 88% | 58% |
| Mar 31 | 73% | 37% |
| Apr 750% date | 50% | 18% |
| Apr 14 | 30% | under 10% |
| Apr 21 | 14% | under 10% |
| Apr 28 | under 10% | under 10% |
Weather by month in Newport
July is the warmest month at Newport 1 NW, TN, averaging 88°F by day and 67°F at night; January is the coldest at 49°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 73% of years.
Warmth for growing adds up to 4,413 growing degree days a year (base 50°F), fewer than at 56% of the 144 Tennessee stations. 38% of them (1,682) have built up by the end of June, and July adds the most, 856. Precipitation totals 46.7 inches a year, most in July (4.9") and least in October (2.4"); May to September bring 43% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 49 | 28 | 3.9 | 100% | 21 | 18 |
| Feb | 54 | 31 | 4.2 | 100% | 17 | 30 |
| Mar | 62 | 37 | 4.3 | 99% | 11 | 107 |
| Apr | 72 | 45 | 4.1 | 73% | 2 | 275 |
| May | 79 | 55 | 4.1 | 0% | 0 | 524 |
| Jun | 85 | 63 | 4.3 | 0% | 0 | 727 |
| Jul | 88 | 67 | 4.9 | 0% | 0 | 856 |
| Aug | 88 | 66 | 3.8 | 0% | 0 | 828 |
| Sep | 83 | 59 | 3.1 | 0% | 0 | 627 |
| Oct | 73 | 47 | 2.4 | 58% | 2 | 314 |
| Nov | 61 | 35 | 3.4 | 100% | 13 | 81 |
| Dec | 52 | 31 | 4.2 | 100% | 19 | 26 |
Monthly normals 1991–2020 at Newport 1 NW, TN (1,036 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, Waterville 2, NC, 14 miles southeast of Newport and 394 feet higher, has a last frost 1 day earlier (April 6), a first frost 3 days later (November 1), a season 7 days longer.
When it snows in Newport, Tennessee
The first measurable snow (0.1 inch or more) in Newport usually arrives around January 14, and the last of the season around February 10. Those are the middle dates across the winters of 1991–2020 at Newport 1 NW, TN, 1.4 miles away: half of years saw snow earlier, half later. Snow fell in 67% of those winters. The last 32°F night of spring typically comes 56 days after the last snow.
Planting calendar for 37821
| 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 6 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 15 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 29 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 37821 is 1 mile from Newport 1 NW, TN, which stands at 1,036 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 37821 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.