Butterfly Lake (Z-1) fishing
Butterfly Lake (Z-1) was last stocked on Aug. 31, 2026 with 201 rainbow trout (11.2 in. average), according to the Utah DWR fish stocking report. It is a lake in Duchesne County, Utah. From 2021 to 2026, DWR stocked 31,061 fish here, the 8th most of 258 stocked waters in Duchesne County.
Butterfly Lake (Z-1) stocking report, last 12 months
| Aug. 31, 2026 | Rainbow trout | 201 | 11.2 in. |
| Aug. 24, 2026 | Rainbow trout | 201 | 11.2 in. |
| Aug. 12, 2026 | Rainbow trout | 250 | 10.8 in. |
| Aug. 3, 2026 | Rainbow trout | 300 | 10.5 in. |
| July 27, 2026 | Rainbow trout | 300 | 10.8 in. |
| July 20, 2026 | Rainbow trout | 300 | 10.8 in. |
| July 16, 2026 | Rainbow trout | 300 | 10.8 in. |
| July 14, 2026 | Tiger trout | 297 | 11.7 in. |
| July 8, 2026 | Rainbow trout | 149 | 11.0 in. |
| July 8, 2026 | Rainbow trout | 149 | 11.0 in. |
| June 29, 2026 | Rainbow trout | 300 | 10.5 in. |
| June 24, 2026 | Brook trout | 496 | 3.0 in. |
| June 24, 2026 | Rainbow trout | 602 | 9.8 in. |
| June 10, 2026 | Rainbow trout | 302 | 10.1 in. |
| June 8, 2026 | Rainbow trout | 300 | 10.1 in. |
| June 3, 2026 | Tiger trout | 298 | 9.9 in. |
Source: Utah DWR fish stocking report. Stocking data fetched Sept. 25, 2026; newest record dated Sept. 23, 2026. DWR posts stockings after they happen and does not publish schedules.
When is Butterfly Lake (Z-1) stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 5 of those 5 years.
2025 stocking: 17 records, first on June 17, last on Sept. 4.
DWR does not publish stocking schedules. Patterns are based on past stocking records and are not a promise of future stocking. Weather, water conditions and hatchery supply change plans. How we read patterns.
Butterfly Lake (Z-1) stocking profile
- First record in the DWR report: June 3, 2002. Since then DWR has logged 442 stockings here in 25 different years, 172,207 fish in all.
- Species stocked 2021 to 2026, by share of fish: rainbow trout 62% (19,187 fish), tiger trout 27% (8,383 fish) and brook trout 11% (3,491 fish).
- Busiest months in the record: July (40% of records) and August (34% of records).
- Stocked fish averaged 9.7 in. from 2021 to 2026 (per-record averages ranged from 2.7 to 14.0 in.).
- Fish stocked 2021 to 2026: 31,061, the 8th most of 258 stocked waters in Duchesne County and 171st of 1,068 statewide.
- Nearest other water with a page: Bud Lake (Z-2), 0.4 mi away.
Computed from Utah DWR stocking records (fish counts and average lengths as DWR reports them). Past stocking is history, not a schedule.
Butterfly Lake (Z-1) stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 16 | 4,745 | 9.8 in. | Rainbow trout, Tiger trout, Brook trout |
| 2025 | 17 | 5,876 | 9.5 in. | Rainbow trout, Tiger trout, Brook trout |
| 2024 | 16 | 4,795 | 10.5 in. | Tiger trout, Rainbow trout |
| 2023 | 17 | 5,027 | 10.0 in. | Rainbow trout, Tiger trout, Brook trout |
| 2022 | 17 | 5,111 | 9.1 in. | Rainbow trout, Tiger trout, Brook trout |
| 2021 | 18 | 5,507 | 9.4 in. | Rainbow trout, Tiger trout, Brook trout |
| 2020 | 18 | 6,727 | 8.8 in. | Tiger trout, Rainbow trout, Brook trout |
| 2019 | 16 | 6,168 | 9.8 in. | Rainbow trout, Tiger trout |
| 2018 | 19 | 6,923 | 9.4 in. | Rainbow trout, Tiger trout, Brook trout |
| 2017 | 17 | 6,200 | 9.8 in. | Rainbow trout, Tiger trout, Brook trout |
| 2016 | 23 | 7,075 | 9.9 in. | Tiger trout, Rainbow trout, Brook trout |
| 2015 | 25 | 7,930 | 8.4 in. | Arctic grayling, Tiger trout, Rainbow trout, Brook trout |
| 2014 | 17 | 7,345 | 9.9 in. | Rainbow trout, Tiger trout, Brook trout |
| 2013 | 17 | 7,016 | 8.9 in. | Tiger trout, Rainbow trout, Brook trout |
| 2012 | 24 | 9,123 | 7.9 in. | Tiger trout, Rainbow trout, Brook trout |
| 2011 | 9 | 5,407 | 9.6 in. | Rainbow trout |
| 2010 | 19 | 8,293 | 9.3 in. | Tiger trout, Rainbow trout, Brook trout |
| 2009 | 19 | 8,510 | 9.4 in. | Rainbow trout, Brook trout |
| 2008 | 17 | 8,397 | 9.6 in. | Rainbow trout, Brook trout |
| 2007 | 16 | 7,844 | 9.4 in. | Rainbow trout, Brook trout |
| 2006 | 14 | 6,735 | 9.7 in. | Rainbow trout, Brook trout |
| 2005 | 13 | 6,463 | 9.6 in. | Rainbow trout, Brook trout |
| 2004 | 20 | 9,557 | 7.9 in. | Rainbow trout, Brook trout |
| 2003 | 18 | 7,648 | 9.2 in. | Rainbow trout, Brook trout |
| 2002 | 20 | 7,785 | 8.2 in. | Rainbow trout, Brook trout |
All stocking records 2021 to Sept. 24, 2025 (85)
| Sept. 4, 2025 | Rainbow trout | 301 | 11.0 in. |
| Sept. 2, 2025 | Rainbow trout | 300 | 12.8 in. |
| Aug. 14, 2025 | Tiger trout | 250 | 11.3 in. |
| Aug. 11, 2025 | Rainbow trout | 312 | 12.4 in. |
| Aug. 4, 2025 | Rainbow trout | 150 | 12.9 in. |
| Aug. 4, 2025 | Rainbow trout | 150 | 12.9 in. |
| July 29, 2025 | Rainbow trout | 351 | 12.4 in. |
| July 21, 2025 | Rainbow trout | 350 | 10.8 in. |
| July 14, 2025 | Rainbow trout | 352 | 10.4 in. |
| July 11, 2025 | Brook trout | 1,359 | 3.6 in. |
| July 10, 2025 | Tiger trout | 300 | 11.1 in. |
| July 9, 2025 | Rainbow trout | 350 | 10.8 in. |
| July 7, 2025 | Rainbow trout | 350 | 10.8 in. |
| June 25, 2025 | Tiger trout | 298 | 11.1 in. |
| June 24, 2025 | Rainbow trout | 348 | 10.1 in. |
| June 17, 2025 | Rainbow trout | 78 | 10.6 in. |
| June 17, 2025 | Rainbow trout | 277 | 10.6 in. |
| Oct. 21, 2024 | Tiger trout | 280 | 12.1 in. |
| Aug. 28, 2024 | Rainbow trout | 309 | 11.0 in. |
| Aug. 14, 2024 | Rainbow trout | 311 | 10.3 in. |
| Aug. 12, 2024 | Tiger trout | 213 | 10.6 in. |
| Aug. 5, 2024 | Rainbow trout | 311 | 10.3 in. |
| July 31, 2024 | Tiger trout | 318 | 10.6 in. |
| July 29, 2024 | Rainbow trout | 322 | 10.3 in. |
| July 23, 2024 | Rainbow trout | 299 | 10.3 in. |
| July 15, 2024 | Tiger trout | 306 | 10.2 in. |
| July 15, 2024 | Rainbow trout | 300 | 10.0 in. |
| July 8, 2024 | Tiger trout | 300 | 10.0 in. |
| July 8, 2024 | Rainbow trout | 325 | 10.0 in. |
| July 3, 2024 | Tiger trout | 300 | 10.0 in. |
| July 2, 2024 | Rainbow trout | 300 | 10.0 in. |
| June 20, 2024 | Tiger trout | 302 | 9.9 in. |
| June 19, 2024 | Rainbow trout | 299 | 12.3 in. |
| Aug. 28, 2023 | Rainbow trout | 200 | 12.1 in. |
| Aug. 22, 2023 | Tiger trout | 300 | 9.4 in. |
| Aug. 21, 2023 | Rainbow trout | 200 | 12.1 in. |
| Aug. 14, 2023 | Rainbow trout | 300 | 11.7 in. |
| Aug. 14, 2023 | Tiger trout | 201 | 9.4 in. |
| Aug. 7, 2023 | Rainbow trout | 315 | 12.1 in. |
| Aug. 2, 2023 | Rainbow trout | 301 | 12.1 in. |
| Aug. 1, 2023 | Rainbow trout | 302 | 9.5 in. |
| July 25, 2023 | Rainbow trout | 305 | 12.0 in. |
| July 18, 2023 | Rainbow trout | 301 | 11.3 in. |
| July 18, 2023 | Tiger trout | 304 | 9.2 in. |
| July 17, 2023 | Brook trout | 494 | 2.7 in. |
| July 11, 2023 | Rainbow trout | 298 | 11.3 in. |
| July 5, 2023 | Tiger trout | 304 | 9.2 in. |
| July 3, 2023 | Rainbow trout | 306 | 11.3 in. |
| June 29, 2023 | Rainbow trout | 296 | 11.6 in. |
| June 29, 2023 | Tiger trout | 300 | 9.4 in. |
| Aug. 29, 2022 | Rainbow trout | 200 | 10.3 in. |
| Aug. 23, 2022 | Rainbow trout | 200 | 10.3 in. |
| Aug. 16, 2022 | Tiger trout | 302 | 9.6 in. |
| Aug. 15, 2022 | Rainbow trout | 300 | 10.0 in. |
| Aug. 8, 2022 | Rainbow trout | 300 | 10.0 in. |
| Aug. 2, 2022 | Tiger trout | 300 | 9.4 in. |
| Aug. 1, 2022 | Rainbow trout | 300 | 10.0 in. |
| July 26, 2022 | Rainbow trout | 300 | 10.0 in. |
| July 19, 2022 | Rainbow trout | 301 | 10.1 in. |
| July 18, 2022 | Tiger trout | 300 | 9.4 in. |
| July 11, 2022 | Rainbow trout | 301 | 10.1 in. |
| July 11, 2022 | Tiger trout | 302 | 9.5 in. |
| July 6, 2022 | Tiger trout | 99 | 9.5 in. |
| July 5, 2022 | Rainbow trout | 306 | 10.1 in. |
| July 4, 2022 | Brook trout | 500 | 2.9 in. |
| June 22, 2022 | Tiger trout | 500 | 9.4 in. |
| June 14, 2022 | Rainbow trout | 300 | 9.4 in. |
| Aug. 30, 2021 | Rainbow trout | 210 | 12.1 in. |
| Aug. 23, 2021 | Rainbow trout | 193 | 12.1 in. |
| Aug. 17, 2021 | Rainbow trout | 301 | 12.1 in. |
| Aug. 16, 2021 | Tiger trout | 499 | 9.2 in. |
| Aug. 9, 2021 | Rainbow trout | 300 | 10.1 in. |
| Aug. 2, 2021 | Tiger trout | 299 | 9.3 in. |
| Aug. 2, 2021 | Rainbow trout | 300 | 10.1 in. |
| July 26, 2021 | Rainbow trout | 300 | 10.1 in. |
| July 20, 2021 | Tiger trout | 308 | 9.6 in. |
| July 19, 2021 | Rainbow trout | 312 | 9.3 in. |
| July 12, 2021 | Rainbow trout | 300 | 9.3 in. |
| July 7, 2021 | Brook trout | 147 | 14.0 in. |
| July 7, 2021 | Rainbow trout | 340 | 9.3 in. |
| July 6, 2021 | Tiger trout | 300 | 9.4 in. |
| July 1, 2021 | Brook trout | 495 | 2.8 in. |
| June 21, 2021 | Rainbow trout | 300 | 9.3 in. |
| June 9, 2021 | Tiger trout | 303 | 9.4 in. |
| June 9, 2021 | Rainbow trout | 300 | 9.3 in. |
Fishing rules
The 2026 Utah Fishing Guidebook lists no water-specific rules for Butterfly Lake (Z-1) under that name, so statewide rules apply unless DWR posts a change. Some waters are covered by a group entry (for example a drainage or its tributaries).
Rules summarized in our own words from the 2026 Utah Fishing Guidebook. DWR can change rules mid-year: check the current guidebook and its updates at wildlife.utah.gov/guidebooks before fishing. See statewide limits.
Email me when Butterfly Lake (Z-1) is stocked
Email me when Butterfly Lake (Z-1) shows up in the DWR stocking report. Alerts start once we switch on email; your choices are saved now.
"Was stocked" alerts come from new rows in the DWR stocking report. "Often stocked around now" heads-ups come from past stocking records only. DWR does not publish stocking schedules, so a heads-up is never a promise. We store your email only for these alerts; ask us to delete it at [email protected]. Privacy.
Butterfly Lake (Z-1) questions
When is Butterfly Lake (Z-1) stocked?
DWR does not publish stocking schedules. Past records show Butterfly Lake (Z-1) was stocked in mid to late June (5 of the last 5 years), early to mid July (5 of the last 5 years), late July to early August (5 of the last 5 years) and mid to late August (5 of the last 5 years). The most recent stocking in the DWR report is dated Aug. 31, 2026.
What fish are in Butterfly Lake (Z-1)?
Since 2021 DWR has stocked rainbow trout, tiger trout and brook trout.
What are the fishing limits at Butterfly Lake (Z-1)?
The 2026 guidebook lists no water-specific rules under this name, so statewide limits apply unless DWR posts a change. See our statewide limits page and check the guidebook.
Stocking: Utah DWR fish stocking report, fetched Sept. 25, 2026. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Sept. 24, 2026. Found an error? [email protected]. Verify rules with DWR before fishing.