Frost dates for Jamaica Plain, Massachusetts
Half of years have their last spring frost by April 19, but 1 year in 10 still frosts after May 3.
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 3
- 1 year in 5
- April 28
- 3 years in 10
- April 24
- 2 years in 5
- April 21
- Half of years (the median)
- April 19
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 8
- 1 year in 5
- October 12
- 3 years in 10
- October 16
- 2 years in 5
- October 20
- Half of years (the median)
- October 23
- Growing season
- about 185 days
- Hardiness zones nearby
- 6b, 7a
- Summer days
- a usual high of about 28 °C82 °F
- Lettuce and spinach run to seed
- June 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 ~3 °C37 °F · low ~-7 °C19 °F · rain ~98 mm3.9 in
- February
- high ~4 °C40 °F · low ~-6 °C21 °F · rain ~91 mm3.6 in
- March
- high ~8 °C47 °F · low ~-2 °C28 °F · rain ~114 mm4.5 in
- April
- high ~15 °C59 °F · low ~3 °C38 °F · rain ~110 mm4.3 in
- May
- high ~21 °C69 °F · low ~9 °C48 °F · rain ~92 mm3.6 in
- June
- high ~26 °C79 °F · low ~14 °C58 °F · rain ~106 mm4.2 in
- July
- high ~29 °C85 °F · low ~18 °C64 °F · rain ~89 mm3.5 in
- August
- high ~28 °C83 °F · low ~17 °C62 °F · rain ~94 mm3.7 in
- September
- high ~24 °C76 °F · low ~13 °C55 °F · rain ~101 mm4 in
- October
- high ~18 °C64 °F · low ~6 °C43 °F · rain ~128 mm5 in
- November
- high ~11 °C53 °F · low ~1 °C34 °F · rain ~101 mm4 in
- December
- high ~6 °C42 °F · low ~-4 °C26 °F · rain ~129 mm5.1 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Jamaica Plain station (listed by NOAA as Jamaica Plain, USC00193890), at 42.30, -71.12. 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
02115, 02119, 02120, 02121, 02122, 02124, 02125, 02126, 02130, 02131, 02132, 02134, 02135, 02136, 02138, 02139, 02140, 02163, 02170, 02215, 02445, 02446, 02452, 02453, 02457, 02458, 02459, 02460, 02461, 02462, 02464, 02465, 02466, 02467, 02468, 02472, 02478, 02481, 02482, 02492, 02494.
What can I plant here, and when? ›
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Hingham, MA, last frost by April 25
- West Medway, MA, last frost by April 30
- Beverly, MA, last frost by May 4
- Lawrence, MA, last frost by April 13
- Worcester Regional Airport, MA, last frost by April 23
- Providence T F Green Airport, RI, last frost by April 11
Other stations in Massachusetts.
- E Wareham, MA, last frost by April 21
- Tully Lake, MA, last frost by April 25
- Belchertown, MA, last frost by May 3
- Westfield Barnes Municipal Airport, MA, last frost by May 3
- Rowe 3 NE, MA, last frost by May 14
- Lenox Dale, MA, last frost by May 7