When was Dillon Reservoir last stocked?

The latest reported stocking was Jun 12 to 18, 2026, according to Colorado agency reports.

How often is Dillon Reservoir stocked?

It was stocked 3 times in the last 12 months. Across all years on record, most stockings come in May and September to October.

Is Dillon Reservoir stocked often?

The most stocked water in Summit County (44 stocking days on record). Stocked more often than 94% of Colorado waters on our record. We count each day the agency reported stocking it.

How warm is the water near Dillon Reservoir?

The USGS gage read 44°F on Sep 28. Trout are sluggish below about 45°F. Fish slow and deep, midday is often best.

Dillon Reservoir trout stocking

Summit County, Colorado · lake · 9,018 ft elevation

Dillon Reservoir was last stocked 4 months ago (Jun 12 to 18, 2026). We have 44 stockings on record since May 12, 2015, 3 in the last 12 months. Most stockings come in May and September to October.

Last stocked

4 months ago

Jun 12 to 18, 2026

Next planned

Not announced

Last 12 months

3 stockings

Water temperature

44°F

Cold for trout

The most stocked water in Summit County (44 stocking days on record).
Stocked more often than 94% of Colorado waters on our record.

River conditions

USGS gage: BLUE RIVER BELOW DILLON, CO. (3 km away).

Water temperature: 44°F
Flow: 54 cfs; about normal for the last six weeks
Gage height: 0.86 ft

Cold for trout. Trout are sluggish below about 45°F. Fish slow and deep, midday is often best.

Water temperature (daily high), last six weeks (°F), daily. Latest: 45 °F on Sep 27. The green band is the ideal range for trout.

Streamflow, last six weeks (cfs), daily. Latest: 54 cfs on Sep 27.

Latest reading Sep 28, 2026, 8:15 PM UTC. USGS data are provisional. Gage page at USGS.

Weather at Dillon Reservoir

Tonight
38°F
Showers And Thunderstorms Likely
68% rain · wind 5 mph
Tuesday
58°F
Chance Rain Showers
47% rain · wind 1 to 5 mph
Tuesday Night
39°F
Showers And Thunderstorms Likely
59% rain · wind 5 mph
Wednesday
55°F
Rain Showers Likely
68% rain · wind 3 to 7 mph
Wednesday Night
34°F
Chance Rain Showers
45% rain · wind 3 to 7 mph
Thursday
61°F
Mostly Sunny
4% rain · wind 5 mph

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

When is Dillon Reservoir stocked?

Most stockings come in May and September to October.

By month, all years

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

Year by year

	Jan	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov
2026				1	1
2025				1	1		1			1
2024			1				1	1	1
2023	1		1					2	1
2022		1				1		2
2021	1						1	1	1
2020									1	1
2019				1	1				1	1

Stocking history

20262 stockings

Date	Species	Since previous
Week of Jun 12Latest Jun 12 to Jun 18	Trout	3 weeks
Week of May 22 May 22 to May 28	Trout	28 weeks

20254 stockings

Date	Species	Since previous
Week of Nov 7 Nov 7 to Nov 13	Trout	11 weeks
Week of Aug 22 Aug 22 to Aug 28	Trout	9 weeks
Week of Jun 20 Jun 20 to Jun 26	Trout	7 weeks
Week of May 2 May 2 to May 8	Trout	30 weeks

20244 stockings

Date	Species	Since previous
Week of Oct 4 Oct 4 to Oct 10	Trout	23 days
Week of Sep 11 Sep 11 to Sep 17	Trout	41 days
Week of Aug 1 Aug 1 to Aug 7	Trout	104 days
Week of Apr 19 Apr 19 to Apr 25	Trout	198 days

20235 stockings

Week of Oct 4 trout
Week of Sep 28 trout
Week of Sep 1 trout
Week of Apr 24 trout
Week of Jan 31 trout

20224 stockings

Week of Sep 23 trout
Week of Sep 2 trout
Week of Jul 29 trout
Week of Mar 8 trout

20214 stockings

Week of Oct 15 trout
Week of Sep 30 trout
Week of Aug 16 trout
Week of Jan 25 trout

20202 stockings

Week of Nov 25 trout
Week of Oct 30 trout

20194 stockings

Week of Nov 8 trout
Week of Oct 14 trout
Week of Jun 5 trout
Week of May 24 trout

20183 stockings

Week of Oct 26 trout
Week of Oct 23 trout
Week of May 17 trout

20174 stockings

Week of Nov 15 trout
Week of Oct 27 trout
Week of Jul 14 trout
Week of May 9 trout

20163 stockings

Week of Oct 25 trout
Week of Jul 5 trout
Week of Mar 29 trout

20155 stockings

Week of Sep 8 trout
Week of Aug 25 trout
Week of May 26 trout
Week of May 19 trout
Week of May 12 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 Dillon Reservoir?

Summit County, Colorado. The marker is the agency's location for this water; streams are often stocked at several access points.

Directions Larger map Colorado fishing regulations

Stocked waters near Dillon Reservoir

Trent Pondpond · 4 mistocked Aug 1, 2025
Officers Gulch Pondpond · 6 mistocked Oct 16, 2019
Tenmile Creek, Northstream · 6 mistocked Sep 8, 2020
Curtain Pondspond · 8 mistocked Aug 7, 2024
Sawmill Reservoirlake · 9 mistocked Jun 16, 2023
Jefferson Lakelake · 15 mistocked May 29, 2026
Urad Mine Lakelake · 15 mistocked Aug 21, 2026
Montgomery Reservoirlake · 17 mistocked Jul 17, 2026

All stocked waters in Summit County Stocked this week in Colorado

Questions about Dillon Reservoir

When was Dillon Reservoir last stocked?: The latest reported stocking was Jun 12 to 18, 2026, according to Colorado agency reports.
How often is Dillon Reservoir stocked?: It was stocked 3 times in the last 12 months. Across all years on record, most stockings come in May and September to October.
Is Dillon Reservoir stocked often?: The most stocked water in Summit County (44 stocking days on record). Stocked more often than 94% of Colorado waters on our record. We count each day the agency reported stocking it.
How warm is the water near Dillon Reservoir?: The USGS gage read 44°F on Sep 28. Trout are sluggish below about 45°F. Fish slow and deep, midday is often best.

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.