Your nature year
Hillsboro, Oregonthrough the year
Also for Newberg, OR, Forest Grove, OR: the same nearby places.
When do frost, green-up and fall color come to Hillsboro?
Leaves usually come out around Feb 19 and the first flowers around Apr 6. Hillsboro usually sees its last spring frost around Apr 16 and its first fall frost around Oct 23, a frost-free stretch of about 190 days at the Portland-Hillsboro Airport weather station (1.7 mi).
Statewide, Oregon's fall color is usually well under way by late October. Head southeast for the closest of the 11 places we follow around Hillsboro. The closest place we follow is Tualatin River Refuge, 11 miles away, for fall & winter wildlife, mid-winter (local timing). For fall foliage, the nearest is Wind River (56 mi, usually well under way by late October (statewide)).
Updated Oct 2. 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)
Near Hillsboro right now
- Fall color is usually well under way by late October in OregonStatewide · USA-NPN volunteer observations, 2020–2025 · not a forecast~3 weeks
- First fall frost usually around Oct 23 · last spring frost around Apr 16NOAA 1991–2020 normals, Portland-Hillsboro Airport (1.7 mi, 50% dates)~3 weeks
- Ridgefield Refuge · 23 mi · Local timing: September through DecemberFall & winter wildlife · in its window nowIn season
- Fall foliage · Wind River · 56 miStatewide: usually well under way by late October~3 weeks
Your guide around Hillsboro
- Fall
- Winter
Places on this map, as a list
Nearby, season by season
Fall foliage
Fall color in WashingtonNational forest
56 mi
Statewide timing: By late OctoberUSA National Phenology Network ↗
Fall color in OregonNational forest
59 mi
Statewide timing: By late OctoberUSA National Phenology Network ↗
Fall color in OregonNational forest
101 mi
Statewide timing: By late OctoberUSA National Phenology Network ↗
Spring migration
Sandpipers and dunlin in WashingtonWildlife refuge
107 mi
Season: Late April and early MayU.S. Fish and Wildlife Service ↗
Wildflowers
Wildflowers in WashingtonNational park
104 mi
Usual peak: Late July to early AugustNational Park Service ↗
Fall & winter wildlife
Ducks, geese and cranes in WashingtonWildlife refuge
23 mi
Season: September through DecemberU.S. Fish and Wildlife Service ↗
Hillsboro's nature year
- Feb: Spring green-upFeb
- Spring migration · Nisqually RefugeApr–May
- Apr: Last spring frostApr
- Wildflowers · Mount RainierJul–Aug
- Oct: Fall color (OR)NowOct
- Oct: First fall frostNowOct
- Fall & winter wildlife · Tualatin River RefugeDec–Feb
Hillsboro's year at a glance
- Frost possible
- Frost-free, ~Apr 16 to ~Oct 23
- First leaf ~Feb 19
- First bloom ~Apr 6
- Fall color under way ~Oct 25 (OR)
- Today
Frost and green-up
Last spring frost
Apr 16
Average (50% date)
First fall frost
Oct 23
About 190 days without frost between
Spring green-up
Feb 19
First bloom around Apr 6
Frost: NOAA 1991–2020 climate normals at Portland-Hillsboro Airport (1.7 mi from Hillsboro), 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 Hillsboro?
On average around Oct 23, and the last spring frost around Apr 16: about 190 days without frost between. These are NOAA's 1991–2020 normals at Portland-Hillsboro Airport, 1.7 miles away (the day a 32 °F night is as likely as not).
When does spring green-up reach Hillsboro?
The USA-NPN Spring Index puts first leaf around Feb 19 and first bloom around Apr 6, on average for 1991–2020 at the town.
Where can I see fall foliage near Hillsboro?
Wind River, 56 miles (statewide: usually well under way by late October); Mt. Hood, 59 miles (statewide: usually well under way by late October); McKenzie Pass, 101 miles (statewide: usually well under way by late October). Distances are straight-line.
Where can I see spring migration near Hillsboro?
Nisqually Refuge, 107 miles (local timing: Late April and early May). Distances are straight-line.
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) · USA National Phenology Network, colored leaves observations (opens in a new tab) (Oct 2)