Cutthroat Trout Stocked · 6 plants · last September 17, 2025 Last stocked September 17, 2025 · avg 2 in · 6 plants
Cutthroat Trout species guideHeart Lake fishing
Heart Lake fishing has Cutthroat Trout, Golden Trout, and Arctic Grayling on the stocking report. It is stocked about 0.7 times a year since 2011, most often in June and September. Species guides list dawn and dusk as the active times.
- Last stocked
- September 17, 2025
- · Cutthroat Trout
- Plants on record
- 11
- Since 2011
- Species recorded
- 3
- Average size
- 1.6 in
- Elevation
- 6,588.8 ft
Fish at Heart Lake
Around the dates Heart Lake is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 49.6°F in September, 49.6°F in June, 60.3°F in July, 58.6°F in August. That is air temperature at these coordinates, not water temperature. Open-Meteo
Cutthroat Trout Stocked · 6 plants · last September 17, 2025 
Golden Trout Stocked · 3 plants · last September 30, 2024 Best: dawn, dusk 
Arctic Grayling Stocked · 2 plants · last June 8, 2021 Last stocked June 8, 2021 · avg 1 in · 2 plants
Arctic Grayling species guideHow Heart Lake is stocked
No plants recorded in 2013, 2015, 2018, 2020, and 2023.
Fish stocked in 2011
3,000
Fish stocked in 2012
4,000
Fish stocked in 2014
300
Fish stocked in 2016
2,000
Fish stocked in 2017
2,000
Fish stocked in 2019
300
Fish stocked in 2021
4,500
Fish stocked in 2022
4,200
Fish stocked in 2024
1,000
Fish stocked in 2025
300
Stocking history
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| September 17, 2025 | Cutthroat Trout | 300 | 2.23 in | report |
| September 30, 2024 | Golden Trout | 1,000 | 1.53 in | report |
| October 19, 2022 | Cutthroat Trout | 4,200 | 2.25 in | report |
| June 8, 2021 | Arctic Grayling | 4,500 | 1 in | report |
| July 31, 2019 | Cutthroat Trout | 300 | 1.93 in | report |
| September 12, 2017 | Golden Trout | 2,000 | 1.09 in | report |
| August 16, 2016 | Cutthroat Trout | 2,000 | 1.31 in | report |
| July 29, 2014 | Cutthroat Trout | 300 | 1.79 in | report |
| June 5, 2012 | Arctic Grayling | 4,000 | 1 in | report |
| September 12, 2011 | Golden Trout | 1,000 | 0.93 in | report |
| August 31, 2011 | Cutthroat Trout | 2,000 | 2.21 in | report |
Access and facts
Advisories, closures, regulations and water conditions change. Check the Montana Fish, Wildlife & Parks before you go.
Nearest lakes
Public land at Heart Lake
Heart Lake is 0.5 miles outside the edge of Lolo National Forest.
Boundaries from Public Lands DB, part of the same network.
Common questions
What fish are at Heart Lake?
Fishing Heart Lake usually means Cutthroat Trout: Cutthroat Trout accounts for 6 of 11 plants on record, ahead of Golden Trout and one more. Cutthroat Trout was last stocked September 17, 2025, averaging 2 in. Golden Trout was last stocked September 30, 2024, averaging 1.2 in. Arctic Grayling was last stocked June 8, 2021, averaging 1 in.
When is Heart Lake stocked?
Last stocked September 17, 2025. It is stocked about 0.7 times a year since 2011, most often in June and September. No plants recorded in 2013, 2015, 2018, 2020, and 2023.
How big are the fish stocked at Heart Lake?
Stocked fish average 1.6 in. Cutthroat Trout average 2 in. Golden Trout average 1.2 in. Arctic Grayling average 1 in.
Which lakes near Heart Lake were stocked more recently?
Echo Lake (7.2 mi), Lake Inez (8.7 mi), Lake Alva (9 mi), and Lindbergh Lake (9.3 mi) were stocked more recently. Lake Inez is also stocked with Cutthroat Trout, Lake Alva is also stocked with Cutthroat Trout, and Lindbergh Lake is also stocked with Cutthroat Trout.