Mason Lake fish stocking
King County, Washington
Mason Lake in King County, Washington was last stocked on August 9, 2026 with 820 rainbow trout fry from Tokul Cr Hatchery. Across the 2 years shown here, WDFW released 1,640 fish in 2 separate stockings. Stockings here are most common in August and September.
When Mason Lake gets fish
Stocking history
Washington reports the exact release date.
2026 · 820 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Rainbow Trout | 820 | — | Fry |
2023 · 820 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Rainbow Trout | 820 | — | Fry |
Frequently asked questions
When was Mason Lake last stocked?
WDFW records show Mason Lake was last stocked on August 9, 2026 (8 weeks ago), with 820 rainbow trout fry.
What fish are stocked in Mason Lake?
Mason Lake has been stocked with rainbow trout in the years shown here (2023–2026).
When does Mason Lake usually get stocked?
Most fish have been stocked in August and September. Exact dates change from year to year, so check back or see WDFW's official stocking page.
Do I need a license to fish Mason Lake?
Yes, anglers generally need a valid Washington fishing license. Check the current Washington fishing regulations for seasons, limits and any special rules for Mason Lake.
Other stocked waters in King County
Jakes Lake
Lower Melakwa Lake
Upper Melakwa Lake
Lake Dorthy
Nine Hour Lake
Mary Lake
All 167 stocked waters in King County →
Source: WDFW Fish Plants (data.wa.gov). Stocked Lakes is not affiliated with Washington Department of Fish and Wildlife. Spot a problem? Let us know.