Your nature year
Boise City, Idahothrough the year
Also for Meridian, ID, Eagle, ID, Kuna, ID: the same nearby places.
When do frost, green-up and fall color come to Boise City?
Leaves usually come out around Mar 21 and the first flowers around Apr 27. Expect about 180 frost-free days in Boise City: the last spring frost usually comes around Apr 24, the first fall one around Oct 21, going by NOAA's Boise Air Terminal station 2.3 miles away. Head west for the closest of the 3 places we follow around Boise City. The closest place we follow is Deer Flat Refuge, 23 miles away, for wildflowers, Apr 1–May 31 (local timing).
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)
Boise City's year at a glance
- Frost possible
- Frost-free, ~Apr 24 to ~Oct 21
- First leaf ~Mar 21
- First bloom ~Apr 27
- Today
Near Boise City right now
- First fall frost usually around Oct 21 · last spring frost around Apr 24NOAA 1991–2020 normals, Boise Air Terminal (2.3 mi, 50% dates)~3 weeks
- Wildflowers · Deer Flat Refuge · 23 miLocal timing: Apr 1–May 31~6 months
Boise City's nature year
- Spring green-upMar
- Wildflowers · Deer Flat RefugeApr–May
- Last spring frostApr
- First fall frostOct
Nearby, season by season
Wildflowers
- Deer Flat Refuge · 23 miLocal timing: Apr 1–May 31~6 months
- Craters of the Moon · 135 miusually Jun 1–30~8 months
- John Day Fossil Beds · 135 miLocal timing: Apr 1–Jul 31~6 months
Snow in Boise City
Snow usually becomes possible around Nov 22 (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 Boise Air Terminal (2.3 mi away): 18 inches of snow in an average year, about 6.1 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 24
Average (50% date)
First fall frost
Oct 21
About 180 days without frost between
Spring green-up
Mar 21
First bloom around Apr 27
Frost: NOAA 1991–2020 climate normals at Boise Air Terminal (2.3 mi from Boise City), 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 Boise City?
On average around Oct 21, and the last spring frost around Apr 24: about 180 days without frost between. These are NOAA's 1991–2020 normals at Boise Air Terminal, 2.3 miles away (the day a 32 °F night is as likely as not).
When does spring green-up reach Boise City?
The USA-NPN Spring Index puts first leaf around Mar 21 and first bloom around Apr 27, on average for 1991–2020 at the town.
Where can I see wildflowers near Boise City?
Deer Flat Refuge, 23 miles (local timing: Apr 1–May 31); Craters of the Moon, 135 miles (usually Jun 1–30); John Day Fossil Beds, 135 miles (local timing: Apr 1–Jul 31). Distances are straight-line.
When does it start snowing in Boise City?
Snow usually becomes possible around Nov 22: our calculation from NOAA's daily snow chances: the first day the chance of 0.1" or more of snow reaches 10%, at Boise Air Terminal. An average year brings 18 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)