Diamond Fork River fishing
Diamond Fork River was last stocked on Sept. 28, 2026 with 8,125 cutthroat trout (2.7 in. average), according to the Utah DWR fish stocking report. It is a river or stream in Utah County, Utah. From 2021 to 2026, DWR stocked 120,011 fish here, the 3rd most of 58 stocked waters in Utah County.
Recent stockings at Diamond Fork River
- Sept. 28, 20268,125 cutthroat trout, 2.7 in. average
- June 10, 202617,564 brown trout, 3.2 in. average
- Nov. 6, 20256,005 cutthroat trout, 3.5 in. average
- May 28, 202518,900 brown trout, 4.1 in. average
- Sept. 9, 20246,032 cutthroat trout, 3.0 in. average
- May 9, 202415,015 brown trout, 3.3 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Diamond Fork River facts
- Last stocked
- Sept. 28, 2026 (43 days ago): 8,125 cutthroat trout
- Stockings in 2026
- 2 (25,689 fish): 17,564 brown trout and 8,125 cutthroat trout
- County
- Utah County
- Size
- Approximately 12 miles
- Stocked since 2021
- brown trout and cutthroat trout
- Likely catch (DWR)
- brown trout
- Average size stocked
- 3.5 in. (2021 to 2026)
- County rank
- 3rd most fish of 58 stocked waters in Utah County since 2021
- Name in DWR report
- DIAMOND FK R
- Nearest water
- Little Diamond Creek, 4.2 mi
- Rules
- Statewide rules (no water-specific entry in the 2026 guidebook)
Diamond Fork River stocking report, last 12 months
| Sept. 28, 2026 | Cutthroat trout | 8,125 | 2.7 in. |
| June 10, 2026 | Brown trout | 17,564 | 3.2 in. |
Source: Utah DWR fish stocking report. Stocking data fetched Nov. 10, 2026; newest record dated Nov. 19, 2026. DWR posts stockings after they happen and does not publish schedules.
Diamond Fork River stocking profile
- First record in the DWR report: Sept. 23, 2019. Since then DWR has logged 19 stockings here in 8 different years, 144,687 fish in all.
- Species stocked 2021 to 2026, by share of fish: brown trout 83% (99,333 fish) and cutthroat trout 17% (20,678 fish).
- Busiest months in the record: June (32% of records) and September (21% of records).
- Stocked fish averaged 3.5 in. from 2021 to 2026 (per-record averages ranged from 2.4 to 6.0 in.). The yearly average was 5.2 in. in 2021 and 4.0 in. in 2025.
- Fish stocked 2021 to 2026: 120,011, the 3rd most of 58 stocked waters in Utah County and 50th of 1,076 statewide.
- Nearest other water with a page: Little Diamond Creek, 4.2 mi away.
Computed from Utah DWR stocking records (fish counts and average lengths as DWR reports them). Past stocking is history, not a schedule.
When is Diamond Fork River stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 5 of those 5 years.
2025 stocking: 2 records, first on May 28, last on Nov. 6.
DWR does not publish stocking schedules. This is past stocking, not a promise. How we read patterns.
Diamond Fork River stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 2 | 25,689 | 3.0 in. | Cutthroat trout, Brown trout |
| 2025 | 2 | 24,905 | 4.0 in. | Cutthroat trout, Brown trout |
| 2024 | 2 | 21,047 | 3.2 in. | Cutthroat trout, Brown trout |
| 2023 | 3 | 36,608 | 3.2 in. | Brown trout |
| 2022 | 2 | 5,936 | 4.6 in. | Brown trout |
| 2021 | 3 | 5,826 | 5.2 in. | Cutthroat trout, Brown trout |
| 2020 | 4 | 19,665 | 5.1 in. | Rainbow trout, Brown trout |
| 2019 | 1 | 5,011 | 2.5 in. | Cutthroat trout |
All stocking records 2021 to Nov. 10, 2025 (12)
| Nov. 6, 2025 | Cutthroat trout | 6,005 | 3.5 in. |
| May 28, 2025 | Brown trout | 18,900 | 4.1 in. |
| Sept. 9, 2024 | Cutthroat trout | 6,032 | 3.0 in. |
| May 9, 2024 | Brown trout | 15,015 | 3.3 in. |
| July 8, 2023 | Brown trout | 10,668 | 2.7 in. |
| June 29, 2023 | Brown trout | 5,940 | 4.9 in. |
| May 4, 2023 | Brown trout | 20,000 | 3.0 in. |
| Sept. 28, 2022 | Brown trout | 2,296 | 3.9 in. |
| June 23, 2022 | Brown trout | 3,640 | 5.0 in. |
| Oct. 13, 2021 | Cutthroat trout | 516 | 2.4 in. |
| June 22, 2021 | Brown trout | 4,860 | 5.5 in. |
| Feb. 4, 2021 | Brown trout | 450 | 6.0 in. |
Fishing rules
No water-specific entry for Diamond Fork River in the 2026 guidebook: statewide limits apply unless a group entry (such as a drainage) covers it.
From the 2026 Utah Fishing Guidebook, in our own words. Rules can change mid-year: check wildlife.utah.gov/guidebooks before fishing.
Access and facilities
- Other activities
- Cycling, Hiking, Mountain biking, OHV or 4WD trails, Wildlife watching
- Facilities
- Covered picnic area, Drinking water, Electrical hookups, Fire rings, Picnic tables, Restrooms, Trails/shoreline paths
- Camping
- RV camping
Facility list from DWR Fish Utah. Check with the land manager before you go; facilities close seasonally.
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Diamond Fork River questions
When is Diamond Fork River stocked?
DWR does not publish stocking schedules. Past records show Diamond Fork River was stocked in late June (3 of the last 5 years). The most recent stocking in the DWR report is dated Sept. 28, 2026.
What fish are in Diamond Fork River?
DWR lists brown trout as likely catches and cutthroat trout as possible. Since 2021 DWR has stocked brown trout and cutthroat trout.
Stocking: Utah DWR fish stocking report, fetched Nov. 10, 2026. Size, program, species and facilities: DWR Fish Utah. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Nov. 10, 2026. Found an error? Tell us. Verify rules with DWR before fishing.