Mason Lake trout stocking
King County, Washington · lake · about 4,174 ft elevation
Mason Lake was last stocked 3 months ago (Aug 9, 2026). We have 4 stockings on record since Jun 29, 2017, 1 in the last 12 months (820 fish). Most stockings come in August. Species stocked: rainbow trout.
- Number 59 of 194 stocked waters in King County by stocking days.
- Stocked about as often as a typical Washington water on our record.
River conditions
Nearest USGS gage: SF SNOQUALMIE RIVER AB ALICE CREEK NEAR GARCIA, WA (3 km away, on a different stream or lake).
- Flow
- 243 cfs
- much higher than usual for the last six weeks
- Gage height
- 10.44 ft
Latest reading Nov 9, 2026, 8:15 AM UTC. USGS data are provisional. Gage page at USGS.
Weather at Mason Lake
- Overnight34°FCloudy8% rain · wind 13 mph
- Monday42°FMostly Cloudy then Rain100% rain · wind 6 to 14 mph
- Monday Night38°FRain93% rain · wind 2 to 8 mph
- Tuesday45°FLight Rain100% rain · wind 2 to 7 mph
- Tuesday Night42°FLight Rain Likely then Mostly Cloudy63% rain · wind 6 to 16 mph
- Veterans Day51°FMostly Cloudy3% rain · wind 3 to 16 mph
Forecast from the National Weather Service for this location, refreshed hourly.
When is Mason Lake stocked?
Most stockings come in August.
By month, all years
Year by year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | |||||||||||
| 2023 | 1 | |||||||||||
| 2020 | 1 | |||||||||||
| 2017 | 1 |
What is stocked
| Species | Stockings | Fish | Fish per stocking |
|---|---|---|---|
| Rainbow trout | 4 | 3,260 | 815 |
Stocking history
20261 stocking · 820 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Aug 9Latest Sunday | Rainbow trout | 820 2 lb | 1067 days | Tokul Cr Hatchery |
20231 stocking · 820 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Sep 7 Thursday | Rainbow trout | 820 3 lb | 1118 days | Tokul Cr Hatchery |
20201 stocking · 820 fish
| Date | Species | Fish | Since previous | Hatchery |
|---|---|---|---|---|
Aug 15 Saturday | Rainbow trout | 820 2 lb | 1143 days | Tokul Cr Hatchery |
20171 stocking · 800 fish
- Jun 29 rainbow trout, 800 fish
From Washington fish and wildlife agency reports, collected nightly and kept after the agency takes them down. Agencies revise reports; check the agency's report before you go. Seasons and limits: Washington fishing regulations.
Where is Mason Lake?
King County, Washington. Approximate: the marker is the USGS place-name point for this water, not an agency location.
Stocked waters near Mason Lake
- Kulla Lake Littlelake · 1 mistocked Sep 21, 2023
- Mason Lake Littlelake · 1 mistocked Jul 24, 2024
- Kulla Kulla Lakelake · 1 mistocked Jun 21, 2025
- Island Lakelake · 1 mistocked Sep 17, 2025
- Blazer Lakelake · 1 mistocked Jul 18, 2022
- Talapus Lakelake · 2 mistocked Sep 27, 2020
- Pratt Lakelake · 2 mistocked Sep 7, 2024
- Pratt Lake Littlelake · 2 mistocked Sep 15, 2025
All stocked waters in King CountyStocked this week in Washington
Questions about Mason Lake
- When was Mason Lake last stocked?
- The latest reported stocking was Aug 9, 2026 (rainbow trout, 820 fish), according to Washington agency reports.
- How often is Mason Lake stocked?
- It was stocked once in the last 12 months. Across all years on record, most stockings come in August.
- Is Mason Lake stocked often?
- Number 59 of 194 stocked waters in King County by stocking days. Stocked about as often as a typical Washington water on our record. We count each day the agency reported stocking it.
- What kind of trout are stocked in Mason Lake?
- Rainbow trout (4 stockings, 3,260 fish).