Thomas Reservoir trout stocking
Boulder County, Colorado · lake · 5,154 ft elevation
Thomas Reservoir was last stocked 4 months ago (May 22 to 28, 2026). We have 29 stockings on record since Apr 6, 2015, 3 in the last 12 months. Most stockings come in March to May.
- The second most stocked of 17 waters in Boulder County.
- Stocked more often than 83% of Colorado waters on our record.
Weather at Thomas Reservoir
- Tonight55°FChance Rain Showers38% rain · wind 3 mph
- Tuesday67°FChance Rain Showers then Slight Chance Showers And Thunderstorms30% rain · wind 6 mph
- Tuesday Night54°FRain Showers Likely60% rain · wind 6 mph
- Wednesday65°FRain Showers Likely64% rain · wind 5 to 10 mph
- Wednesday Night49°FChance Rain Showers52% rain · wind 9 mph
- Thursday66°FChance Rain Showers then Mostly Sunny40% rain · wind 7 mph
Forecast from the National Weather Service for this location, refreshed hourly.
When is Thomas Reservoir stocked?
Most stockings come in March to May.
By month, all years
Year by year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 2 | ||||||||||
| 2025 | 1 | |||||||||||
| 2024 | 1 | 1 | 1 | |||||||||
| 2023 | 1 | 1 | ||||||||||
| 2022 | 1 | 1 | 1 | |||||||||
| 2021 | 1 | 2 | 1 | |||||||||
| 2020 | 1 | 1 | 1 | |||||||||
| 2019 | 1 | 1 | 1 |
Stocking history
20263 stockings
| Date | Species | Since previous |
|---|---|---|
Week of May 22Latest May 22 to May 28 | Trout | 3 weeks |
Week of May 1 May 1 to May 7 | Trout | 7 weeks |
Week of Mar 13 Mar 13 to Mar 19 | Trout | 24 weeks |
20251 stocking
| Date | Species | Since previous |
|---|---|---|
Week of Sep 26 Sep 26 to Oct 2 | Trout | 52 weeks |
20243 stockings
| Date | Species | Since previous |
|---|---|---|
Week of Sep 27 Sep 27 to Oct 3 | Trout | 23 weeks |
Week of Apr 19 Apr 19 to Apr 25 | Trout | 52 days |
Week of Feb 27 Feb 27 to Mar 4 | Trout | 152 days |
20232 stockings
- Week of Sep 28 trout
- Week of Feb 20 trout
20223 stockings
- Week of Oct 7 trout
- Week of May 6 trout
- Week of Mar 7 trout
20214 stockings
- Week of Sep 30 trout
- Week of Apr 27 trout
- Week of Apr 14 trout
- Week of Mar 1 trout
20203 stockings
- Week of Oct 6 trout
- Week of Apr 7 trout
- Week of Mar 9 trout
20193 stockings
- Week of Oct 16 trout
- Week of Apr 29 trout
- Week of Mar 12 trout
20183 stockings
- Week of Nov 21 trout
- Week of Apr 30 trout
- Week of Mar 6 trout
20162 stockings
- Week of Oct 11 trout
- Week of May 3 trout
20152 stockings
- Week of May 4 trout
- Week of Apr 6 trout
From Colorado 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: Colorado fishing regulations.
Where is Thomas Reservoir?
Boulder County, Colorado. The marker is the agency's location for this water; streams are often stocked at several access points.
Stocked waters near Thomas Reservoir
- Erie Lakelake · 2 mistocked Oct 4, 2024
- Waneka Lakelake · 3 mistocked May 1, 2026
- Park Lakelake · 5 mistocked Oct 31, 2025
- Klubert-Warembourg Pondpond · 6 mistocked Oct 3, 2025
- Harper Lakelake · 6 mistocked Mar 13, 2026
- Tom Frost Reservoirlake · 7 mistocked Oct 3, 2025
- KOA Lake - Boulderlake · 8 mistocked Apr 3, 2026
- Thunderbird Lakelake · 9 mistocked Nov 10, 2017
All stocked waters in Boulder CountyStocked this week in Colorado
Questions about Thomas Reservoir
- When was Thomas Reservoir last stocked?
- The latest reported stocking was May 22 to 28, 2026, according to Colorado agency reports.
- How often is Thomas Reservoir stocked?
- It was stocked 3 times in the last 12 months. Across all years on record, most stockings come in March to May.
- Is Thomas Reservoir stocked often?
- The second most stocked of 17 waters in Boulder County. Stocked more often than 83% of Colorado waters on our record. We count each day the agency reported stocking it.
Stocking report from Colorado Parks and Wildlife, which lists the waters stocked with catchable trout (about 10 inches) in the week before each report. Locations from the Colorado Fishing Atlas.