Frost dates for Greenville 1 NNE, New Hampshire
Half of years have their last spring frost by May 10, but 1 year in 10 still frosts after May 27.
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 27
- 1 year in 5
- May 20
- 3 years in 10
- May 17
- 2 years in 5
- May 13
- Half of years (the median)
- May 10
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- September 25
- 1 year in 5
- September 29
- 3 years in 10
- October 1
- 2 years in 5
- October 3
- Half of years (the median)
- October 6
- Growing season
- about 147 days
- Hardiness zone nearby
- 6a
- Summer days
- a usual high of about 25 °C77 °F
- Lettuce and spinach run to seed
- July to August, 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 ~-1 °C30 °F · low ~-10 °C14 °F · rain ~87 mm3.4 in
- February
- high ~1 °C34 °F · low ~-10 °C15 °F · rain ~83 mm3.3 in
- March
- high ~5 °C42 °F · low ~-5 °C22 °F · rain ~108 mm4.2 in
- April
- high ~13 °C55 °F · low ~0 °C33 °F · rain ~110 mm4.4 in
- May
- high ~19 °C66 °F · low ~6 °C42 °F · rain ~95 mm3.7 in
- June
- high ~23 °C74 °F · low ~11 °C52 °F · rain ~108 mm4.3 in
- July
- high ~26 °C79 °F · low ~15 °C58 °F · rain ~92 mm3.6 in
- August
- high ~25 °C78 °F · low ~13 °C56 °F · rain ~98 mm3.8 in
- September
- high ~21 °C70 °F · low ~9 °C49 °F · rain ~108 mm4.2 in
- October
- high ~14 °C58 °F · low ~3 °C38 °F · rain ~138 mm5.4 in
- November
- high ~8 °C46 °F · low ~-1 °C29 °F · rain ~104 mm4.1 in
- December
- high ~2 °C35 °F · low ~-7 °C20 °F · rain ~126 mm5 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Greenville 1 NNE station (listed by NOAA as Greenville 1 NNE, USC00273658), at 42.78, -71.80. 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
01420, 01431, 01462, 01469, 01474, 03033, 03047, 03048, 03055, 03057, 03071, 03082…
+4 moreShow fewer
03084, 03086, 03452, 03458.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Tully Lake, MA, last frost by April 25
- Hopkinton Lake, NH, last frost by May 6
- Lawrence, MA, last frost by April 13
- Worcester Regional Airport, MA, last frost by April 23
- Epping, NH, last frost by May 7
- Belchertown, MA, last frost by May 3
Other stations in New Hampshire.
- Newport, NH, last frost by May 14
- E Sandwich, NH, last frost by May 6
When do I plant? · Where the dates come from
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