Grasshopper Reservoir Fish Stocking
Montana · 1947–2025 on record
According to Montana fish & wildlife agency, Grasshopper Reservoir was last stocked September 23, 2025 with Rainbow Trout. Grasshopper Reservoir has 87 stocking records on file, spanning 1947–2025, with about 362,893 fish stocked over that period.
When Grasshopper Reservoir is stocked
Grasshopper Reservoir is typically stocked in spring, most often in April — 25 stocking events in that peak month.
Angler's Field Guide
Fishing Tips & Stocking Guide for Grasshopper Reservoir
Practical advice on fish behavior, recommended tackle, and state regulations for anglers fishing in Montana.
Post-Plant Behavior & Timing
Hatchery-raised fish are conditioned to pelleted feed and open raceways. Following a release into Grasshopper Reservoir, they typically congregate in schools near public access points, boat ramps, or inlets for the first 24 to 48 hours while adjusting to natural water conditions.
Since Grasshopper Reservoir was last stocked September 23, 2025, anglers visiting within 1 to 2 weeks of a reported event generally experience the highest activity before fish disperse into deeper cover.
State Regulations & Licensing
- •Fishing License: A valid Montana freshwater fishing license is required for anglers age 16 and older.Purchase Montana license online →
- •Official Rules & Limits: Bag limits, bait restrictions, and seasonal boundaries are set by Montana fish & wildlife agency.Official Montana regulations guidebook →
- •Ethical Conservation: Use barbless hooks and keep fish submerged in water during unhooking.Trout Thermal Advisory: When water temperatures rise above 68°F (20°C), released trout face severe mortality from thermal exhaustion. Target warmwater species or fish early in the morning when lakes and streams warm up.
Recommended Tackle & Presentations
Techniques tailored to the species stocked in Grasshopper Reservoir:
Stocked Trout Tactics
Use light 4–6 lb monofilament or fluorocarbon line. Float scented dough bait (PowerBait) 12–18" off bottom using a sliding slip-sinker rig with a size 14–16 treble hook. For active casting, throw 1/16 to 1/8 oz inline spinners (Panther Martin, Rooster Tail) or small spoons (Kastmaster) along drop-offs.
Bass & Panfish Approach
Target visible structure such as docks, weed lines, and fallen trees. Small 1/32 to 1/16 oz jig heads with soft plastic grubs or live worms under a float work well for crappie and bluegill; soft plastic worms or spinnerbaits work well for bass.
Rainbow Trout Profile Tips
The most commonly targeted stocked trout in the country, taken on bait, spinners, and flies alike; a common first fish for new anglers.
Tiger Trout Profile Tips
Known for hitting lures and flies aggressively; a favorite for anglers seeking a distinctive, hard-fighting stocked trout.
Recommended Tackle for Grasshopper Reservoir
Field-tested tackle and presentations matched to the species stocked here.
Berkley PowerBait Floating Trout Dough
Hatchery-raised trout are conditioned to pelleted scents; scented dough floated 12–18 inches off bottom consistently triggers strikes.
Panther Martin Classic Teardrop Inline Spinner
The heavy convex blade spins instantly upon retrieval, sending vibration through the water that triggers aggressive reaction bites along drop-offs.
Sliding Sinker & Treble Hook Rigging Kit
Sliding egg sinkers allow cautious trout to run with bait without feeling line drag, while size 14–16 treble hooks keep dough bait securely pinned.
Gary Yamamoto 5-inch Custom Senko Stickbaits
The heavy salt-impregnated plastic produces a unique horizontal shimmy on the fall around weed beds, docks, and submerged timber.
As an Amazon Associate, StockedWaters earns from qualifying purchases at no additional cost to you. Recommendations are chosen for hatchery-conditioned fish behavior and ethical rigging. We may receive a referral commission if you buy through these links. Read our editorial policy & standards.
Nearby stocked waters
Other stocked waters near Grasshopper Reservoir, freshest activity first.
Faber Reservoir
13 mi3 species · 78 records
Last stocked November 2025
Ross Reservoir
11 mi3 species · 71 records
Last stocked September 2025
H.C. Kuhr Reservoir
4 mi6 species · 74 records
Last stocked April 2025
Harrys Pond
13 mi1 species · 1 records
Last stocked May 2024
Ramberg Reservoir
8 mi1 species · 1 records
Last stocked July 1994
Lyons Reservoir
8 mi6 species · 20 records
Last stocked April 1993
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| September 23, 2025 | Rainbow Trout | 2,597 | 7.3" | Montana fish & wildlife agency |
| April 30, 2025 | Rainbow Trout | 4,000 | 2.87" | Montana fish & wildlife agency |
| May 28, 2024 | Rainbow Trout | 4,000 | 3.23" | Montana fish & wildlife agency |
| September 13, 2023 | Rainbow Trout | 3,056 | 5.69" | Montana fish & wildlife agency |
| May 30, 2023 | Rainbow Trout | 4,263 | 2.74" | Montana fish & wildlife agency |
| May 25, 2022 | Rainbow Trout | 4,000 | 3.25" | Montana fish & wildlife agency |
| October 1, 2021 | Rainbow Trout | 3,060 | 7.19" | Montana fish & wildlife agency |
| June 1, 2021 | Rainbow Trout | 4,000 | 3.1" | Montana fish & wildlife agency |
Show 42 more stocking records →
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| May 6, 2020 | Rainbow Trout | 4,261 | 3.08" | Montana fish & wildlife agency |
| September 23, 2019 | Rainbow Trout | 1,017 | 7.17" | Montana fish & wildlife agency |
| July 8, 2019 | Tiger Trout | 500 | 4.93" | Montana fish & wildlife agency |
| May 13, 2019 | Rainbow Trout | 2,500 | 2.65" | Montana fish & wildlife agency |
| May 3, 2018 | Rainbow Trout | 2,500 | 2.47" | Montana fish & wildlife agency |
| October 11, 2017 | Rainbow Trout | 3,264 | 6.97" | Montana fish & wildlife agency |
| April 13, 2017 | Rainbow Trout | 2,500 | 2.02" | Montana fish & wildlife agency |
| April 7, 2016 | Rainbow Trout | 2,500 | 2.09" | Montana fish & wildlife agency |
| September 15, 2015 | Rainbow Trout | 3,101 | 6.73" | Montana fish & wildlife agency |
| April 16, 2015 | Rainbow Trout | 2,500 | 2.01" | Montana fish & wildlife agency |
| May 14, 2014 | Rainbow Trout | 2,500 | 2.45" | Montana fish & wildlife agency |
| September 13, 2013 | Rainbow Trout | 3,030 | 5.99" | Montana fish & wildlife agency |
| June 26, 2013 | Tiger Trout | 150 | 3" | Montana fish & wildlife agency |
| June 19, 2013 | Rainbow Trout | 2,500 | 3.27" | Montana fish & wildlife agency |
| May 8, 2012 | Rainbow Trout | 2,500 | 2.72" | Montana fish & wildlife agency |
| October 4, 2011 | Rainbow Trout | 2,998 | 4.13" | Montana fish & wildlife agency |
| May 18, 2011 | Rainbow Trout | 2,500 | 3.09" | Montana fish & wildlife agency |
| July 8, 2010 | Rainbow Trout | 1 | 5.9" | Montana fish & wildlife agency |
| June 15, 2010 | Rainbow Trout | 1,923 | 4.45" | Montana fish & wildlife agency |
| September 25, 2009 | Rainbow Trout | 2,996 | 4" | Montana fish & wildlife agency |
| April 21, 2009 | Rainbow Trout | 2,500 | 4" | Montana fish & wildlife agency |
| May 1, 2008 | Rainbow Trout | 2,500 | 3.2" | Montana fish & wildlife agency |
| September 14, 2007 | Rainbow Trout | 294 | 4.54" | Montana fish & wildlife agency |
| September 14, 2007 | Rainbow Trout | 5,719 | 3.57" | Montana fish & wildlife agency |
| April 24, 2007 | Rainbow Trout | 2,500 | 3.4" | Montana fish & wildlife agency |
| May 4, 2006 | Rainbow Trout | 3,000 | 3.22" | Montana fish & wildlife agency |
| April 20, 2006 | Rainbow Trout | 2,500 | 3.4" | Montana fish & wildlife agency |
| September 15, 2005 | Rainbow Trout | 3,255 | 5.12" | Montana fish & wildlife agency |
| April 13, 2005 | Rainbow Trout | 2,500 | 3.57" | Montana fish & wildlife agency |
| April 14, 2004 | Rainbow Trout | 2,000 | 3.5" | Montana fish & wildlife agency |
| September 24, 2003 | Rainbow Trout | 1,610 | 3.79" | Montana fish & wildlife agency |
| September 24, 2003 | Rainbow Trout | 1,500 | 4.37" | Montana fish & wildlife agency |
| May 22, 2003 | Rainbow Trout | 2,500 | 4.3" | Montana fish & wildlife agency |
| April 30, 2002 | Rainbow Trout | 1,000 | 4.2" | Montana fish & wildlife agency |
| May 1, 2001 | Rainbow Trout | 2,375 | 3.7" | Montana fish & wildlife agency |
| April 18, 2000 | Rainbow Trout | 2,000 | 3.5" | Montana fish & wildlife agency |
| April 20, 1999 | Rainbow Trout | 2,500 | 3.3" | Montana fish & wildlife agency |
| April 21, 1998 | Rainbow Trout | 4,500 | 3.4" | Montana fish & wildlife agency |
| April 14, 1998 | Rainbow Trout | 10,076 | 2.3" | Montana fish & wildlife agency |
| September 15, 1997 | Rainbow Trout | 4,403 | 4.7" | Montana fish & wildlife agency |
| April 17, 1997 | Rainbow Trout | 3,000 | 3.1" | Montana fish & wildlife agency |
| April 25, 1996 | Rainbow Trout | 3,915 | 6.5" | Montana fish & wildlife agency |
Showing 50 of 87 stocking records.
Frequently asked
When was Grasshopper Reservoir last stocked?
According to Montana fish & wildlife agency, Grasshopper Reservoir was last stocked September 23, 2025 with Rainbow Trout.
What fish species are stocked in Grasshopper Reservoir?
Grasshopper Reservoir is stocked with Rainbow Trout, Tiger Trout, and Largemouth Bass.
What time of year is Grasshopper Reservoir stocked?
Grasshopper Reservoir is typically stocked in spring, most often in April.
How often is Grasshopper Reservoir stocked?
Grasshopper Reservoir is stocked intermittently — 87 recorded stockings between 1947 and 2025.
How many fish have been stocked in Grasshopper Reservoir?
About 362,893 fish have been stocked in Grasshopper Reservoir across 87 recorded events since 1947, per Montana fish & wildlife agency.
What size are the fish stocked in Grasshopper Reservoir?
Fish stocked in Grasshopper Reservoir average about 4.0 inches, based on the sizes the agency reported.
Do you need a fishing license to fish Grasshopper Reservoir?
Yes, all anglers age 16 and older generally need a valid Montana freshwater fishing license. Always review current regulations from Montana fish & wildlife agency for site-specific rules, bag limits, or stamps.
How do you catch stocked trout in Grasshopper Reservoir?
Freshly stocked trout in Grasshopper Reservoir typically respond well to floating dough bait (such as PowerBait) floated 12–18 inches off bottom on light 4–6 lb leader, live nightcrawlers under a bobber, and small inline spinners or spoons retrieved along shorelines and drop-offs.