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Rainbow stocking
Lowland lake · Kittitas County · 129.4 acres · 2,792 ft
3,000 rainbows on May 26
4 months agoNaches Hatchery
Average size
Catchables
0.42 lbeach
Nothing new since May 26. Holdovers are bigger and warier than fresh stock.
2026 so far
3,000
60% of a normal year
Normal year
4,978
average of 10 seasons
Typical size
Catchables
0.42 lb each
Stocking season
May–Jun
when the truck comes
This year against a 10-season average
2026normal
Recent plants
| Date | Species | Number | Size | Fish/lb |
|---|---|---|---|---|
| May 26 | Rainbow | 3,000 | Catchables · 0.42 lb each | 2.4 |
| May 28 | Rainbow | 3,000 | Catchables · 0.42 lb each | 2.4 |
| May 28 | Rainbow | 3,000 | Catchables · 0.42 lb each | 2.4 |
| May 30 | Rainbow | 3,000 | Catchables · 0.42 lb each | 2.4 |
| Jun 8 | Rainbow | 3,000 | Catchables · 0.42 lb each | 2.4 |
| Jun 10 | Rainbow | 2,544 | Catchables · 0.42 lb each | 2.4 |
| May 20 | Rainbow | 2,520 | Catchables · 0.42 lb each | 2.4 |
| Jun 5 | Rainbow | 2,496 | Catchables · 0.42 lb each | 2.4 |
21 rainbow releases on record since 2015 · from WDFW's fish plants data, as published.
This lake on WDFWWDFW fishing prospects calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainbow Trout | ||||||||||||
| Cutthroat Trout | ||||||||||||
| Kokanee |
quiet → best this month
WDFW rates rainbow trout best in April through June.
WDFW draws one calendar per species for the whole state, so it shows the season's shape rather than this lake's own record. Check the rules for when each species is open here. This lake on WDFW
be the first to say how Cooper Lake fished
No catch reports yet for this water.
Currently
52°
Clearfeels like 50°
Tue
Favorable
58° 48°
wind 6 kt · 14% rain
Wed
Favorable
70° 49°
wind 7 kt · 1% rain
Thu
Favorable
76° 52°
wind 7 kt · 0% rain
Fri
Favorable
72° 49°
wind 5 kt · 0% rain
Sat
Favorable
75° 48°
wind 5 kt · 0% rain
Sun
Favorable
78° 52°
wind 5 kt · 0% rain
Mon
Favorable
67° 44°
wind 6 kt · 5% rain
The current regulation for Cooper Lake could not be confidently verified from a structured source, so this dashboard won't guess. Check the official WDFW sport fishing rules before fishing.
rules are shown exactly as published and cover every species at this location — they can change at any time, so always confirm with WDFW before fishingWant to know the best time to fish for rainbow trout this week at Cooper Lake?
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Wind now
1mph
SW · gusting 3
Gusts · 12h
9mph
laying down
wind mph gusts