Frost dates for Hollis, Maine
Half of years have their last spring frost by May 14, but 1 year in 10 still frosts after May 28.
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 28
- 1 year in 5
- May 23
- 3 years in 10
- May 20
- 2 years in 5
- May 17
- Half of years (the median)
- May 14
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- September 16
- 1 year in 5
- September 21
- 3 years in 10
- September 24
- 2 years in 5
- September 27
- Half of years (the median)
- September 30
- Growing season
- about 136 days
- Hardiness zones nearby
- 5a, 5b
- Summer days
- a usual high of about 26 °C78 °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 °C29 °F · low ~-13 °C8 °F · rain ~91 mm3.6 in
- February
- high ~0 °C33 °F · low ~-13 °C9 °F · rain ~92 mm3.6 in
- March
- high ~5 °C41 °F · low ~-7 °C19 °F · rain ~116 mm4.6 in
- April
- high ~12 °C54 °F · low ~-1 °C30 °F · rain ~123 mm4.9 in
- May
- high ~19 °C66 °F · low ~5 °C40 °F · rain ~100 mm3.9 in
- June
- high ~24 °C75 °F · low ~10 °C51 °F · rain ~113 mm4.4 in
- July
- high ~27 °C80 °F · low ~14 °C56 °F · rain ~105 mm4.1 in
- August
- high ~26 °C79 °F · low ~12 °C54 °F · rain ~97 mm3.8 in
- September
- high ~21 °C71 °F · low ~8 °C46 °F · rain ~102 mm4 in
- October
- high ~14 °C58 °F · low ~2 °C35 °F · rain ~146 mm5.7 in
- November
- high ~8 °C46 °F · low ~-3 °C26 °F · rain ~114 mm4.5 in
- December
- high ~2 °C35 °F · low ~-9 °C16 °F · rain ~124 mm4.9 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Hollis station (listed by NOAA as Hollis, USC00173862), at 43.65, -70.67. 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
04030, 04042, 04047, 04048, 04056, 04061, 04087, 04095.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Portland International Jetport, ME, last frost by April 26
- E Sandwich, NH, last frost by May 6
- Epping, NH, last frost by May 7
- Turner, ME, last frost by May 1
- Westport Island, ME, last frost by April 28
- Hopkinton Lake, NH, last frost by May 6
Other stations in Maine.
- Acadia NP, ME, last frost by April 27
When do I plant? · Where the dates come from
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