Idaho
When to catch Deer Flat Refugeat its best
Deer Flat Refuge through the year: wildflowers (local timing: April to May) and winter wildlife (local timing: October through January). Each has its own page with spots, sources and the latest reports.
RIGHT NOW · SEP 30
- Latest reportNo dated report this season; the posters below show each usual window.
- This weekend (NWS)Sat mostly sunny, 78°F · Sun mostly sunny, 78°F
- Park alertsCheck the managing agency before you go
When are you going?
Fall at Deer Flat Refuge
Good in fall
- Wintering ducks on Lake Lowell (peak in mid-December)
From each place's own sources; no peak claimed.
Winter at Deer Flat Refuge
- SEASON · WINTER WILDLIFEDeer Flat RefugeOctober through JanuaryIdaho
“October through January” · U.S. Fish and Wildlife Service ↗
Also good in winter
- Wintering ducks on Lake Lowell (peak in mid-December)
From each place's own sources; no peak claimed.
Spring at Deer Flat Refuge
Also good in spring
- Wildflowers and returning songbirds
From each place's own sources; no peak claimed.
Summer at Deer Flat Refuge
Good in summer
- Shorebirds on the east-end mudflats, when water conditions are right
From each place's own sources; no peak claimed.
Best spots
Wildflowers
- Observation Hill TrailThrough sagebrush uplands to a viewing platform over almost the whole Lake Lowell UnitU.S. Fish and Wildlife Service ↗
- Sagebrush TrailShort accessible interpretive trail from the visitor center to the Upper DamU.S. Fish and Wildlife Service ↗
- East Dike TrailRuns through a variety of habitatsU.S. Fish and Wildlife Service ↗
- Pollinator TrailOne of the trails near the visitor centerU.S. Fish and Wildlife Service ↗
Winter wildlife
- Observation Hill Trail viewing platformLooks out over almost the entire Lake Lowell Unit; hike up through sagebrush, or request a permit to drive to the platformU.S. Fish and Wildlife Service ↗
- Swallow Nest TrailAn accessible trail across the Upper Dam, where you can see grebes, herons, egrets, Canada geese and a variety of ducksU.S. Fish and Wildlife Service ↗
Next 7 days at Deer Flat Refuge
- TodaySunny75° / 52°1% rain
- ThuMostly Sunny76° / 53°–
- FriMostly Sunny78° / 54°–
- SatMostly Sunny78° / 56°–
- SunMostly Sunny78° / 58°1% rain
- MonMostly Sunny78° / 56°1% rain
- TueSunny77° / 55°–
Today: sunrise 7:44 a.m., sunset 7:31 p.m., light until 8:00 p.m. · moon waning gibbous, 77% lit (our calculation)
Nearby, and when they peak
- SEASON · SPRING MIGRATIONMalheur RefugeLate winter through the end of May111 mi
“late winter through the end of May” · U.S. Fish and Wildlife Service ↗
- SEASON · WILDFLOWERSJohn Day Fossil BedsApril to July, unit by unit116 mi
“April to July, unit by unit” · National Park Service ↗
Towns nearby
- Boise City, ID23 mi
- Twin Falls, ID131 mi
Deer Flat Refuge in pictures

Questions people ask
When are the wildflowers best?
April to May, when a variety of wildflowers bloom and migrating songbirds return. Wildflowers are less common in summer.Source: U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Visit Us ↗ (opens in a new tab)
When is the weather mildest?
September–October and April–May are usually neither too hot nor too cold. In summer the trails can be very hot with little shade.Source: U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Visit Us ↗ (opens in a new tab)
Is there a fee, and can I bring my dog?
There's no charge to visit. Dogs are welcome on a leash of 6 feet or less, and waste must be packed out.Source: U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Visit Us ↗ (opens in a new tab)
When is the best time of day to see the flocks?
Dawn or dusk. The ducks and geese roost on the lake at night and leave in big flocks at dawn to feed nearby; in the daytime, look for geese feeding on the refuge's farm fields.Source: U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Species (Seasons of Wildlife) ↗ (opens in a new tab)
How we know
- Sep 28Park ServiceApril to May for migrating songbirds and wildflowers; trails, swimming season, fall color in OctoberSource (opens U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Visit Us in a new tab)
- Sep 28Park ServiceDuck numbers peak in mid-December on Lake Lowell; goose peak in mid-November; dawn and dusk feeding flightsSource (opens U.S. Fish and Wildlife Service, Deer Flat National Wildlife Refuge: Species (Seasons of Wildlife) in a new tab)