Frost dates for Norris, Tennessee
Half of years have their last spring frost by April 22, but 1 year in 10 still frosts after May 9.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- May 9
- 1 year in 5
- May 2
- 3 years in 10
- April 30
- 2 years in 5
- April 26
- Half of years (the median)
- April 22
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 11
- 1 year in 5
- October 15
- 3 years in 10
- October 19
- 2 years in 5
- October 22
- Half of years (the median)
- October 25
- Growing season
- about 184 days
- Hardiness zones nearby
- 7a, 7b
- Summer days
- a usual high of about 29 °C84 °F
- Lettuce and spinach run to seed
- May to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~7 °C44 °F · low ~-4 °C25 °F · rain ~130 mm5.1 in
- February
- high ~10 °C50 °F · low ~-2 °C28 °F · rain ~136 mm5.4 in
- March
- high ~15 °C60 °F · low ~1 °C33 °F · rain ~139 mm5.5 in
- April
- high ~21 °C70 °F · low ~5 °C41 °F · rain ~146 mm5.7 in
- May
- high ~25 °C77 °F · low ~10 °C51 °F · rain ~110 mm4.3 in
- June
- high ~28 °C83 °F · low ~15 °C59 °F · rain ~124 mm4.9 in
- July
- high ~30 °C85 °F · low ~17 °C63 °F · rain ~137 mm5.4 in
- August
- high ~29 °C85 °F · low ~17 °C62 °F · rain ~108 mm4.3 in
- September
- high ~27 °C80 °F · low ~14 °C56 °F · rain ~103 mm4.1 in
- October
- high ~21 °C69 °F · low ~7 °C44 °F · rain ~86 mm3.4 in
- November
- high ~14 °C57 °F · low ~1 °C34 °F · rain ~102 mm4 in
- December
- high ~9 °C47 °F · low ~-2 °C29 °F · rain ~144 mm5.7 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Norris station (listed by NOAA as Norris, USC00406619), at 36.21, -84.06. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
37705, 37714, 37721, 37754, 37757, 37766, 37769, 37779, 37807, 37828, 37847, 37866, 37938.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Baxter, KY, last frost by April 15
- Big Stone Gap, VA, last frost by April 20
- Whitesburg 2 SE, KY, last frost by April 21
Other stations in Tennessee.
- Elizabethton, TN, last frost by April 19
- Shelby Bottoms Nature, TN, last frost by April 1
- Memphis, TN, last frost by March 29
When do I plant? · Where the dates come from
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