Frost dates for Spokane Felts Field, Washington
Half of years have their last spring frost by April 26, but 1 year in 10 still frosts after May 10.
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 10
- 1 year in 5
- May 5
- 3 years in 10
- May 1
- 2 years in 5
- April 29
- Half of years (the median)
- April 26
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- September 30
- 1 year in 5
- October 4
- 3 years in 10
- October 7
- 2 years in 5
- October 11
- Half of years (the median)
- October 15
- Growing season
- about 170 days
- Hardiness zones nearby
- 6b, 7a
- Summer days
- a usual high of about 28 °C83 °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.
- Nearly every drop is yours
- July to September: rain brings less than a quarter of the water a growing garden needs, about 25 mm1 in a week (how we know)
Month by month
- January
- high ~3 °C38 °F · low ~-3 °C26 °F · rain ~51 mm2 in
- February
- high ~6 °C42 °F · low ~-3 °C27 °F · rain ~34 mm1.3 in
- March
- high ~11 °C51 °F · low ~0 °C32 °F · rain ~46 mm1.8 in
- April
- high ~15 °C60 °F · low ~3 °C37 °F · rain ~38 mm1.5 in
- May
- high ~21 °C70 °F · low ~7 °C44 °F · rain ~43 mm1.7 in
- June
- high ~24 °C76 °F · low ~10 °C50 °F · rain ~38 mm1.5 in
- July
- high ~31 °C87 °F · low ~13 °C56 °F · rain ~17 mm0.7 in
- August
- high ~30 °C86 °F · low ~12 °C54 °F · rain ~14 mm0.5 in
- September
- high ~24 °C76 °F · low ~8 °C47 °F · rain ~17 mm0.7 in
- October
- high ~16 °C60 °F · low ~3 °C38 °F · rain ~37 mm1.5 in
- November
- high ~7 °C45 °F · low ~-1 °C31 °F · rain ~51 mm2 in
- December
- high ~3 °C37 °F · low ~-4 °C26 °F · rain ~55 mm2.2 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Spokane Felts Field station (listed by NOAA as Spokane Felts Fld, USW00094176), at 47.68, -117.32. 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
99016, 99019, 99021, 99023, 99025, 99027, 99036, 99037, 99202, 99203, 99205, 99206, 99207, 99208, 99212, 99216, 99217, 99218, 99223.
What can I plant here, and when? ›
Nearby stations
Other stations in Washington.
- Seattle Sand Point, WA, last frost by March 8
- Tacoma #1, WA, last frost by March 8
- Tacoma Narrows Airport, WA, last frost by March 11