Your nature year
Lewiston, Idahothrough the year
Also for Pullman, WA, Moscow, ID: the same nearby places.
When do frost, green-up and fall color come to Lewiston?
The closest place we follow is Turnbull Refuge, 77 miles away, for wildflowers, usually at its best May 11–20. Lost Horse Canyon (121 mi) is the pick for fall foliage, Oct 1–31 (regional timing). Frost usually lets go around Apr 6 and comes back around Oct 26, according to NOAA's Lewiston Airport station, 1.7 miles away: roughly 203 days without it. Spring takes about 6 weeks to go from leaf to bloom. Spring green-up reaches town around Mar 4, with first blooms around Apr 13. Head north for the closest of the 3 places we follow around Lewiston.
Updated Sep 27. Sources: US Census Bureau, 2024 Gazetteer (places) ↗ (opens in a new tab), US Census Bureau, city and town population estimates, 2024 ↗ (opens in a new tab), NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal) ↗ (opens in a new tab)
Lewiston's year at a glance
- Frost possible
- Frost-free, ~Apr 6 to ~Oct 26
- First leaf ~Mar 4
- First bloom ~Apr 13
- Today
Near Lewiston right now
- First fall frost usually around Oct 26 · last spring frost around Apr 6NOAA 1991–2020 normals, Lewiston Airport (1.7 mi, 50% dates)~4 weeks
- Fall foliage · Lost Horse Canyon · 121 miRegional timing: Oct 1–31~3 days
Lewiston's nature year
- Spring green-upMar
- Last spring frostApr
- Wildflowers · Turnbull RefugeMay
- First fall frostOct
- Fall foliage · Lost Horse CanyonOct
Nearby, season by season
Fall foliage
- Lost Horse Canyon · 121 miRegional timing: Oct 1–31~3 days
Wildflowers
- Turnbull Refuge · 77 miusually May 11–20~7 months
- Hanford Reach · 118 miLocal timing: Apr 1–May 15~6 months
Snow in Lewiston
Snow usually becomes possible around Dec 8 (our calculation from NOAA's daily snow chances: the first day the chance of 0.1" or more of snow reaches 10%). NOAA's normals at Lewiston Airport (1.7 mi away): 13 inches of snow in an average year, about 4.2 days with 1 inch or more.
NOAA's chance of at least 0.1 inch of snow on each date (one value per week, September to May), averaged over 1991–2020. A typical year, not a forecast.
Frost and green-up
Last spring frost
Apr 6
Average (50% date)
First fall frost
Oct 26
About 203 days without frost between
Spring green-up
Mar 4
First bloom around Apr 13
Frost: NOAA 1991–2020 climate normals at Lewiston Airport (1.7 mi from Lewiston), the day a 32 °F night is as likely as not. Green-up: the USA-NPN Spring Index, 1991–2020 average at the town.
Questions people ask
When is the first frost in Lewiston?
On average around Oct 26, and the last spring frost around Apr 6: about 203 days without frost between. These are NOAA's 1991–2020 normals at Lewiston Airport, 1.7 miles away (the day a 32 °F night is as likely as not).
When does spring green-up reach Lewiston?
The USA-NPN Spring Index puts first leaf around Mar 4 and first bloom around Apr 13, on average for 1991–2020 at the town.
Where can I see fall foliage near Lewiston?
Lost Horse Canyon, 121 miles (regional timing: Oct 1–31). Distances are straight-line.
Where can I see wildflowers near Lewiston?
Turnbull Refuge, 77 miles (usually May 11–20); Hanford Reach, 118 miles (local timing: Apr 1–May 15). Distances are straight-line.
When does it start snowing in Lewiston?
Snow usually becomes possible around Dec 8: our calculation from NOAA's daily snow chances: the first day the chance of 0.1" or more of snow reaches 10%, at Lewiston Airport. An average year brings 13 inches (NOAA 1991–2020). A typical year, not a forecast.Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal snowfall) ↗ (opens in a new tab), NOAA NCEI U.S. Climate Normals 1991–2020 (daily snowfall probabilities) ↗ (opens in a new tab)
How we know
US Census Bureau, 2024 Gazetteer (places) (opens in a new tab) (Sep 27) · US Census Bureau, city and town population estimates, 2024 (opens in a new tab) (Sep 27) · NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal) (opens in a new tab) (Sep 27) · USA National Phenology Network, Spring Index 1991–2020 averages (opens in a new tab) (Sep 27)