Mason Lake Fish Stocking
King County, Washington · 1995–2023 on record
According to Washington fish & wildlife agency, Mason Lake was last stocked September 7, 2023 with Rainbow Trout. Mason Lake has 13 stocking records on file, spanning 1995–2023, with about 8,833 fish stocked over that period.
When Mason Lake is stocked
Mason Lake is typically stocked in summer and fall, most often in August — 4 stocking events in that peak month.
Nearby stocked waters
Other stocked waters near Mason Lake, freshest activity first.
Windy Lake
3 miKing County · 1 species · 6 records
Last stocked September 2025
Island Lake
1 miKing County · 1 species · 11 records
Last stocked September 2025
Lake Caroline
5 miKing County · 1 species · 5 records
Last stocked September 2025
Rainbow Lake
1 miKing County · 1 species · 30 records
Last stocked July 2025
Kulla Kulla Lake
1 miKing County · 1 species · 9 records
Last stocked June 2025
My Lake
3 miKing County · 2 species · 9 records
Last stocked October 2024
By species
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Source |
|---|---|---|---|
| September 7, 2023 | Rainbow Trout | 820 | Washington fish & wildlife agency |
| August 15, 2020 | Rainbow Trout | 820 | Washington fish & wildlife agency |
| June 29, 2017 | Rainbow Trout | 800 | Washington fish & wildlife agency |
| August 5, 2014 | Rainbow Trout | 408 | Washington fish & wildlife agency |
| October 18, 2010 | Rainbow Trout | 425 | Washington fish & wildlife agency |
| July 22, 2010 | Rainbow Trout | 390 | Washington fish & wildlife agency |
| March 6, 2007 | Rainbow Trout | 390 | Washington fish & wildlife agency |
| March 5, 2007 | Rainbow Trout | 390 | Washington fish & wildlife agency |
Show 5 more stocking records →
| Date | Species | Number | Source |
|---|---|---|---|
| August 17, 2004 | Rainbow Trout | 780 | Washington fish & wildlife agency |
| September 18, 2003 | Rainbow Trout | 1,750 | Washington fish & wildlife agency |
| September 19, 2001 | Rainbow Trout | 750 | Washington fish & wildlife agency |
| August 18, 2000 | Rainbow Trout | 325 | Washington fish & wildlife agency |
| September 11, 1995 | Rainbow Trout | 785 | Washington fish & wildlife agency |
The reporting agency did not include fish sizes for this water.
Frequently asked
When was Mason Lake last stocked?
According to Washington fish & wildlife agency, Mason Lake was last stocked September 7, 2023 with Rainbow Trout.
What fish species are stocked in Mason Lake?
Mason Lake is stocked with Rainbow Trout.
What time of year is Mason Lake stocked?
Mason Lake is typically stocked in summer and fall, most often in August.
How often is Mason Lake stocked?
Mason Lake is stocked intermittently — 13 recorded stockings between 1995 and 2023.
How many fish have been stocked in Mason Lake?
About 8,833 fish have been stocked in Mason Lake across 13 recorded events since 1995, per Washington fish & wildlife agency.