When was Holter Reservoir last stocked?

The latest reported stocking was Sep 24, 2026 (rainbow trout, 9,875 fish), according to Montana agency reports.

How often is Holter Reservoir stocked?

Stocked 8 times in 2026, mostly in June. Across all years on record, most stockings come in June and September.

Is Holter Reservoir stocked often?

The second most stocked of 12 waters in Lewis and Clark County. Stocked more often than 98% of Montana waters on our record. We count each day the agency reported stocking it.

What kind of trout are stocked in Holter Reservoir?

Rainbow trout (15 stockings, 434,957 fish).

Holter Reservoir trout stocking

Lewis and Clark County, Montana · lake · 3,581 ft elevation

Holter Reservoir was last stocked 7 weeks ago (Sep 24, 2026). We have 15 stockings on record since Jun 25, 2025, 8 in the last 12 months (220,117 fish). Most stockings come in June and September. Species stocked: rainbow trout.

Last stocked

7 weeks ago

Sep 24, 2026

Next planned

Not announced

Last 12 months

8 stockings

220,117 fish

Water temperature

49°F

Cool for trout

The second most stocked of 12 waters in Lewis and Clark County.
Stocked more often than 98% of Montana waters on our record.

River conditions

USGS gage: Missouri River bl Holter Dam nr Wolf Cr MT (7 km away).

Water temperature: 49°F
Flow: 2,540 cfs; about normal for the last six weeks
Gage height: 2.76 ft

Cool for trout. Trout are active but slower; fishing picks up as the water warms through the day.

Water temperature (daily high), last six weeks (°F), daily. Latest: 50 °F on Nov 8. The green band is the ideal range for trout.

Streamflow, last six weeks (cfs), daily. Latest: 2,560 cfs on Nov 8.

Latest reading Nov 9, 2026, 8:45 AM UTC. USGS data are provisional. Gage page at USGS.

Weather at Holter Reservoir

Tonight
40°F
Mostly Cloudy
3% rain · wind 3 to 12 mph
Monday
56°F
Mostly Cloudy
8% rain · wind 2 to 8 mph
Monday Night
42°F
Mostly Cloudy
3% rain · wind 2 to 8 mph
Tuesday
54°F
Partly Sunny
1% rain · wind 8 to 18 mph
Tuesday Night
43°F
Partly Cloudy
wind 8 to 12 mph
Veterans Day
60°F
Mostly Sunny
wind 8 to 14 mph

Forecast from the National Weather Service for this location, refreshed hourly.

When is Holter Reservoir stocked?

Most stockings come in June and September. Stocked 8 times in 2026, mostly in June.

By month, all years

Stockings of Holter Reservoir by month, all years on record. This month is shown in blue.

Year by year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
2026						4			4
2025						4			3

What is stocked

Species	Stockings	Fish	Fish per stocking	Typical size
Rainbow trout	15	434,957	28,997	8.2 in

Stocking history

20268 stockings · 220,117 fish

Date	Species	Fish	Size	Since previous	Hatchery
Sep 24Latest Thursday · 7 weeks ago	Rainbow trout	9,875	8.3 in	1 day	Big Springs Trout Hatchery
Sep 23 Wednesday · 7 weeks ago	Rainbow trout	32,261	8.4 in	1 day	Big Springs Trout Hatchery
Sep 22 Tuesday · 7 weeks ago	Rainbow trout	31,725	8.3 in	1 day	Big Springs Trout Hatchery
Sep 21 Monday · 7 weeks ago	Rainbow trout	27,894	8.4 in	88 days	Big Springs Trout Hatchery
Jun 25 Thursday	Rainbow trout	14,475	7.3 in	1 day	Big Springs Trout Hatchery
Jun 24 Wednesday	Rainbow trout	43,557	7.3 in	1 day	Big Springs Trout Hatchery
Jun 23 Tuesday	Rainbow trout	45,858	7.1 in	1 day	Big Springs Trout Hatchery
Jun 22 Monday	Rainbow trout	14,472	7.2 in	278 days	Big Springs Trout Hatchery

20257 stockings · 214,840 fish

Date	Species	Fish	Size	Since previous	Hatchery
Sep 17 Wednesday	Rainbow trout	38,808	7.6 in	1 day	Big Springs Trout Hatchery
Sep 16 Tuesday	Rainbow trout	36,378	7.7 in	1 day	Big Springs Trout Hatchery
Sep 15 Monday	Rainbow trout	36,851	7.6 in	11 weeks	Big Springs Trout Hatchery
Jun 30 Monday	Rainbow trout	24,320	8.6 in	3 days	Big Springs Trout Hatchery
Jun 27 Friday	Rainbow trout	28,788	8.3 in	1 day	Big Springs Trout Hatchery
Jun 26 Thursday	Rainbow trout	28,468	8.4 in	1 day	Big Springs Trout Hatchery
Jun 25 Wednesday	Rainbow trout	21,227	8.1 in		Big Springs Trout Hatchery

From Montana 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: Montana fishing regulations.

Where is Holter Reservoir?

Lewis and Clark County, Montana. The marker is the agency's location for this water; streams are often stocked at several access points.

Directions Larger map Montana fishing regulations

Stocked waters near Holter Reservoir

Hauser Reservoirlake · 19 mistocked Oct 6, 2026
Pelican Point #1lake · 20 mistocked May 29, 2026
Helena Valley Regulating Reservoirlake · 21 mistocked May 12, 2026
Spring Meadow Lakelake · 24 mistocked Sep 8, 2026

All stocked waters in Lewis and Clark County Stocked this week in Montana

Questions about Holter Reservoir

When was Holter Reservoir last stocked?: The latest reported stocking was Sep 24, 2026 (rainbow trout, 9,875 fish), according to Montana agency reports.
How often is Holter Reservoir stocked?: Stocked 8 times in 2026, mostly in June. Across all years on record, most stockings come in June and September.
Is Holter Reservoir stocked often?: The second most stocked of 12 waters in Lewis and Clark County. Stocked more often than 98% of Montana waters on our record. We count each day the agency reported stocking it.
What kind of trout are stocked in Holter Reservoir?: Rainbow trout (15 stockings, 434,957 fish).
How warm is the water near Holter Reservoir?: The USGS gage read 49°F on Nov 9. Trout are active but slower; fishing picks up as the water warms through the day.