Lake Mary Ronan fishing

Lake Mary Ronan fishing has Kokanee Salmon, Rainbow Trout, Cutthroat Trout, and Largemouth Bass on the stocking report. Also recorded: Yellow Perch, Northern Pike, and Pumpkinseed. It is stocked about 4.9 times a year since 2011, most often in May and June. Species guides list dawn and dusk for Kokanee Salmon, Rainbow Trout, and Largemouth Bass, dawn, day, and dusk for Yellow Perch and Northern Pike, and dusk for Pumpkinseed.

Lake Mary Ronan
Photo: Derek Swanson from Minneapolis MN, U.S.A, CC BY 2.0
Last stocked
June 16, 2026
· Rainbow Trout
Plants on record
78
Since 2011
Species stocked
4 (+3 also recorded)
Average size
3 in
Elevation
3,702.4 ft

Fish at Lake Mary Ronan

4 stocked · 3 confirmed present

Around the dates Lake Mary Ronan is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 51.9°F in May, 59.9°F in June, 69.2°F in July, 41.2°F in April. That is air temperature at these coordinates, not water temperature. Open-Meteo

Kokanee Salmon Stocked · 38 plants · last May 16, 2024 Best: dawn, dusk

Last stocked May 16, 2024 · avg 2.3 in · 38 plants

Best: dawn, dusk

Kokanee Salmon species guide
Rainbow Trout Stocked · 28 plants · last June 16, 2026 Best: dawn, dusk

Last stocked June 16, 2026 · avg 4.2 in · 28 plants

Best: dawn, dusk

Rainbow Trout species guide
Largemouth Bass Stocked · 11 plants · last August 8, 2024 Best: dawn, dusk

Last stocked August 8, 2024 · avg 1.9 in · 11 plants

Best: dawn, dusk

Largemouth Bass species guide

Lake Mary Ronan State Park is noted for its fishing. It offers an angler’s delight with kokanee salmon, yellow perch and large mouth bass. Activities at Lake Mary Ronan State Park include Fishing, Ice Fishing, and Lake Fishing. (fwp.mt.gov, accessed September 22, 2026)

Drafted by AI from the cited sources and checked before publishing.

How Lake Mary Ronan is stocked

Source: Montana Fish, Wildlife & Parks.

Foy Lake (16.5 mi) was stocked more recently. Foy Lake is also stocked with Kokanee Salmon and Rainbow Trout.

Fish stocked in 2011

385,625

Fish stocked in 2012

522,133

Fish stocked in 2013

458,803

Fish stocked in 2014

46,205

Fish stocked in 2015

427,140

Fish stocked in 2016

401,724

Fish stocked in 2017

434,241

Fish stocked in 2018

40,000

Fish stocked in 2019

430,000

Fish stocked in 2020

459,785

Fish stocked in 2021

421,948

Fish stocked in 2022

403,939

Fish stocked in 2023

367,705

Fish stocked in 2024

387,522

Fish stocked in 2025

30,000

Fish stocked in 2026

27,144

Stocking history

Source: Montana Fish, Wildlife & Parks.
Date Species Quantity Avg. length Source
June 16, 2026Rainbow Trout13,5723.63 inreport
June 16, 2026Rainbow Trout13,5723.63 inreport
June 23, 2025Rainbow Trout30,0003.3 inreport
August 8, 2024Largemouth Bass27,5221.26 inreport
June 10, 2024Rainbow Trout30,0003.29 inreport
May 16, 2024Kokanee Salmon50,0002.6 inreport
May 13, 2024Kokanee Salmon30,0003.39 inreport
April 19, 2024Kokanee Salmon250,0002.5 inreport
September 5, 2023Largemouth Bass13,2662.59 inreport
August 17, 2023Largemouth Bass14,3001.59 inreport
June 13, 2023Rainbow Trout30,1393.07 inreport
May 5, 2023Kokanee Salmon310,0002.5 inreport
June 15, 2022Rainbow Trout27,1873.7 inreport
June 8, 2022Kokanee Salmon376,7522.29 inreport
July 29, 2021Largemouth Bass25,0001.68 inreport
May 27, 2021Rainbow Trout29,8503.47 inreport
May 20, 2021Kokanee Salmon367,0982.75 inreport
July 22, 2020Largemouth Bass25,0003 inreport
June 17, 2020Rainbow Trout34,7853.3 inreport
May 26, 2020Kokanee Salmon400,0003 inreport
July 2, 2019Rainbow Trout30,0003.22 inreport
May 30, 2019Kokanee Salmon400,0002.5 inreport
July 14, 2018Largemouth Bass10,0001.7 inreport
May 21, 2018Rainbow Trout30,0003.59 inreport
August 23, 2017Largemouth Bass25,0001.96 inreport
July 12, 2017Rainbow Trout30,2183.96 inreport
June 20, 2017Kokanee Salmon22,5672.2 inreport
May 30, 2017Kokanee Salmon68,8902.51 inreport
May 17, 2017Kokanee Salmon160,0172.21 inreport
May 10, 2017Kokanee Salmon65,5132.02 inreport
May 10, 2017Kokanee Salmon62,0362.12 inreport
September 16, 2016Rainbow Trout5,0014.1 inreport
August 4, 2016Largemouth Bass25,0001.43 inreport
July 21, 2016Rainbow Trout27,9723.64 inreport
May 26, 2016Kokanee Salmon32,5002.25 inreport
May 20, 2016Kokanee Salmon59,2412.19 inreport
May 16, 2016Kokanee Salmon35,8652.21 inreport
May 16, 2016Kokanee Salmon27,3542.13 inreport
May 3, 2016Kokanee Salmon52,4122.03 inreport
May 2, 2016Kokanee Salmon48,2932.05 inreport
April 28, 2016Kokanee Salmon36,1802 inreport
April 7, 2016Kokanee Salmon51,9061.5 inreport
July 30, 2015Largemouth Bass25,0001.5 inreport
June 25, 2015Rainbow Trout1,6984.45 inreport
June 25, 2015Rainbow Trout3,6124.59 inreport
June 25, 2015Rainbow Trout23,2204.59 inreport
June 18, 2015Kokanee Salmon81,8032.6 inreport
June 9, 2015Kokanee Salmon68,2002.1 inreport
June 8, 2015Kokanee Salmon5,2712.5 inreport
May 8, 2015Kokanee Salmon50,3372.2 inreport
May 5, 2015Kokanee Salmon48,1502.5 inreport
April 30, 2015Kokanee Salmon69,8492.5 inreport
April 16, 2015Kokanee Salmon50,0002 inreport
September 16, 2014Rainbow Trout1,5004.97 inreport
September 16, 2014Rainbow Trout5585.69 inreport
August 21, 2014Largemouth Bass25,0002 inreport
June 30, 2014Rainbow Trout19,1473.77 inreport
July 17, 2013Largemouth Bass25,0002.3 inreport
June 27, 2013Rainbow Trout23,1004.2 inreport
May 28, 2013Rainbow Trout9,3083.53 inreport
May 14, 2013Rainbow Trout95010.47 inreport
May 1, 2013Kokanee Salmon400,4452 inreport
September 19, 2012Rainbow Trout5,5245.38 inreport
May 23, 2012Rainbow Trout31,2373.62 inreport
May 21, 2012Kokanee Salmon263,9272.5 inreport
May 8, 2012Rainbow Trout5,0783.4 inreport
April 20, 2012Kokanee Salmon84,3602 inreport
April 10, 2012Kokanee Salmon132,0072 inreport
September 21, 2011Rainbow Trout5,1854.9 inreport
September 21, 2011Rainbow Trout4,8154.32 inreport
July 11, 2011Cutthroat Trout5,0008.57 inreport
June 16, 2011Kokanee Salmon30,5002 inreport
June 16, 2011Kokanee Salmon18,6052 inreport
June 10, 2011Kokanee Salmon35,4602 inreport
May 25, 2011Rainbow Trout30,1284.05 inreport
May 25, 2011Kokanee Salmon129,1202 inreport
May 3, 2011Kokanee Salmon87,9622 inreport
May 2, 2011Kokanee Salmon38,8502 inreport

Access and facts

Nearest town
Dayton
Boat ramp
Yes
Fee required
Yes
Facilities
restrooms, camping, dock

Lake Mary Ronan State Park (120 acres) has a boat launch and dock, 25 campsites with seasonal electricity, vault toilets, and ADA-accessible facilities. About 8 miles northwest of US-93 at Dayton, seven miles west of Flathead Lake.

Drafted by AI from the cited sources and checked before publishing.

View larger map · Open in Google Maps · Directions

Advisories, closures, regulations and water conditions change. Check the Montana Fish, Wildlife & Parks before you go.

About Lake Mary Ronan

Visitors should store all attractants, day or night, in a closed, hard sided container or vehicle when not in immediate use, and dispose of garbage in bear-resistant dumpsters provided. Also, anglers and boaters must protect Montana's waters from Aquatic Invasive Species, which can be unknowingly transported on equipment. (fwp.mt.gov, accessed September 22, 2026)

Drafted by AI from the cited sources and checked before publishing.

Photo of Lake Mary Ronan
Derek Swanson from Minneapolis MN, U.S.A, CC BY 2.0

Nearest lakes

Rogers Lake 13.2 mi last stocked September 6, 2024 Rainbow Lake 14.7 mi last stocked September 30, 2025 Hubbart Reservoir 15.4 mi last stocked June 6, 2024 Foy Lake 16.5 mi last stocked September 2, 2026 Ashley Creek 18.2 mi last stocked September 4, 2012

Public land at Lake Mary Ronan

Lake Mary Ronan is 0.8 miles outside the edge of Lake Mary Ronan State Park.

Boundaries from Public Lands DB, part of the same network.

Common questions

What fish are at Lake Mary Ronan?

Fishing Lake Mary Ronan usually means Kokanee Salmon: Kokanee Salmon accounts for 38 of 78 plants on record, ahead of Rainbow Trout and 2 more. Kokanee Salmon was last stocked May 16, 2024, averaging 2.3 in. Rainbow Trout was last stocked June 16, 2026, averaging 4.2 in. Largemouth Bass was last stocked August 8, 2024, averaging 1.9 in. Cutthroat Trout was last stocked July 11, 2011, averaging 8.6 in. Yellow Perch, Northern Pike, and Pumpkinseed are recorded here outside the stocking reports.

When is Lake Mary Ronan stocked?

Last stocked June 16, 2026. It is stocked about 4.9 times a year since 2011, most often in May and June.

How big are the fish stocked at Lake Mary Ronan?

Stocked fish average 3 in. Kokanee Salmon average 2.3 in. Rainbow Trout average 4.2 in. Largemouth Bass average 1.9 in. Cutthroat Trout average 8.6 in.

How do you get on Lake Mary Ronan?

There is a boat ramp and a fee is required. The nearest town is Dayton. Facilities include restrooms, camping, and dock. Lake Mary Ronan State Park (120 acres) has a boat launch and dock, 25 campsites with seasonal electricity, vault toilets, and ADA-accessible facilities. About 8 miles northwest of US-93 at Dayton, seven miles west of Flathead Lake.

Which lakes near Lake Mary Ronan were stocked more recently?

Foy Lake (16.5 mi) was stocked more recently. Foy Lake is also stocked with Kokanee Salmon and Rainbow Trout.

Sources (7) +