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Cooper Lake Fish Stocking

Kittitas County, Washington · 1995–2026 on record

Source: Washington fish & wildlife agency· updated 2026-05-26

According to Washington fish & wildlife agency, Cooper Lake was last stocked May 26, 2026 with Rainbow Trout. Cooper Lake has 38 stocking records on file, spanning 1995–2026, with about 155,023 fish stocked over that period.

May 26, 2026
Last stocked
155,023
Fish stocked
2
Species
38
Stocking records

When Cooper Lake is stocked

Cooper Lake is typically stocked in summer, most often in June — 16 stocking events in that peak month.

How Cooper Lake's stockings spread across the calendar year.

Nearby stocked waters

Other stocked waters near Cooper Lake, freshest activity first.

Summit Chief Lake

7 mi

Kittitas County · 1 species · 5 records

Last stocked July 2026

Thorp Lake

4 mi

Kittitas County · 1 species · 30 records

Last stocked October 2025

Opal Lake

5 mi

Kittitas County · 1 species · 6 records

Last stocked August 2025

Glacier Lake

6 mi

Kittitas County · 1 species · 5 records

Last stocked October 2024

Diamond Lake

1 mi

Kittitas County · 1 species · 9 records

Last stocked July 2023

Lila Lake

7 mi

Kittitas County · 1 species · 8 records

Last stocked July 2023

Stocking history

Most recent stockings first. Dates shown at the precision the agency reported.

DateSpeciesNumberSource
May 26, 2026Rainbow Trout3,000Washington fish & wildlife agency
May 28, 2025Rainbow Trout3,000Washington fish & wildlife agency
May 28, 2024Rainbow Trout3,000Washington fish & wildlife agency
May 30, 2023Rainbow Trout3,000Washington fish & wildlife agency
June 8, 2022Rainbow Trout3,000Washington fish & wildlife agency
June 10, 2020Rainbow Trout2,544Washington fish & wildlife agency
May 20, 2020Rainbow Trout2,520Washington fish & wildlife agency
June 5, 2019Rainbow Trout2,496Washington fish & wildlife agency
Show 30 more stocking records →
DateSpeciesNumberSource
May 20, 2019Rainbow Trout2,520Washington fish & wildlife agency
June 11, 2018Rainbow Trout2,750Washington fish & wildlife agency
May 21, 2018Rainbow Trout2,500Washington fish & wildlife agency
June 20, 2017Rainbow Trout283Washington fish & wildlife agency
June 6, 2017Rainbow Trout4,020Washington fish & wildlife agency
May 30, 2017Rainbow Trout3,500Washington fish & wildlife agency
June 2, 2016Rainbow Trout3,000Washington fish & wildlife agency
June 1, 2016Rainbow Trout417Washington fish & wildlife agency
May 18, 2016Rainbow Trout3,350Washington fish & wildlife agency
June 16, 2015Rainbow Trout250Washington fish & wildlife agency
June 2, 2015Rainbow Trout3,875Washington fish & wildlife agency
May 19, 2015Rainbow Trout500Washington fish & wildlife agency
May 4, 2015Rainbow Trout3,250Washington fish & wildlife agency
June 10, 2014Rainbow Trout2,750Washington fish & wildlife agency
May 28, 2014Rainbow Trout3,400Washington fish & wildlife agency
May 22, 2014Rainbow Trout750Washington fish & wildlife agency
June 12, 2013Rainbow Trout2,750Washington fish & wildlife agency
June 4, 2013Rainbow Trout2,137Washington fish & wildlife agency
May 22, 2013Rainbow Trout750Washington fish & wildlife agency
May 21, 2013Rainbow Trout2,970Washington fish & wildlife agency
June 18, 2012Rainbow Trout5,520Washington fish & wildlife agency
June 13, 2012Rainbow Trout2,640Washington fish & wildlife agency
June 12, 2012Rainbow Trout765Washington fish & wildlife agency
August 24, 2010Cutthroat Trout12,168Washington fish & wildlife agency
August 28, 2006Cutthroat Trout12,116Washington fish & wildlife agency
September 11, 2003Cutthroat Trout11,259Washington fish & wildlife agency
August 29, 2000Cutthroat Trout12,662Washington fish & wildlife agency
August 29, 2000Cutthroat Trout12,662Washington fish & wildlife agency
August 20, 1997Cutthroat Trout12,089Washington fish & wildlife agency
August 25, 1995Cutthroat Trout4,860Washington fish & wildlife agency

The reporting agency did not include fish sizes for this water.

Frequently asked

When was Cooper Lake last stocked?

According to Washington fish & wildlife agency, Cooper Lake was last stocked May 26, 2026 with Rainbow Trout.

What fish species are stocked in Cooper Lake?

Cooper Lake is stocked with Rainbow Trout and Cutthroat Trout.

What time of year is Cooper Lake stocked?

Cooper Lake is typically stocked in summer, most often in June.

How often is Cooper Lake stocked?

Cooper Lake is stocked intermittently — 38 recorded stockings between 1995 and 2026.

How many fish have been stocked in Cooper Lake?

About 155,023 fish have been stocked in Cooper Lake across 38 recorded events since 1995, per Washington fish & wildlife agency.

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How this is calculated: compiled automatically from Washington fish & wildlife agency open data — normalized, date-validated, and shown only at the precision the agency reported. Sources & methodology →

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