Hatfield Reservoir Fish Stocking
Montana · 1968–2025 on record
According to Montana fish & wildlife agency, Hatfield Reservoir was last stocked June 9, 2025 with Rainbow Trout. Hatfield Reservoir has 55 stocking records on file, spanning 1968–2025, with about 154,122 fish stocked over that period.
When Hatfield Reservoir is stocked
Hatfield Reservoir is typically stocked in spring, most often in April — 29 stocking events in that peak month.
By species
Angler's Field Guide
Fishing Tips & Stocking Guide for Hatfield 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 Hatfield 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 Hatfield Reservoir was last stocked June 9, 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 Hatfield 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.
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.
Recommended Tackle for Hatfield 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.
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 Hatfield Reservoir, freshest activity first.
Raymond Dam
24 mi8 species · 57 records
Last stocked August 2025
Boxelder Lake
24 mi5 species · 115 records
Last stocked June 2025
Holtan Reservoir
13 mi3 species · 36 records
Last stocked June 2025
Danelson Reservoir
12 mi3 species · 35 records
Last stocked July 2024
Stentoft Reservoir
18 mi1 species · 36 records
Last stocked April 2016
Chabot Reservoir
21 mi1 species · 40 records
Last stocked May 2010
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| June 9, 2025 | Rainbow Trout | 1,000 | 7.03" | Montana fish & wildlife agency |
| May 15, 2024 | Rainbow Trout | 3,000 | 2.92" | Montana fish & wildlife agency |
| May 17, 2023 | Rainbow Trout | 3,000 | 2.63" | Montana fish & wildlife agency |
| May 11, 2022 | Rainbow Trout | 3,000 | 3.25" | Montana fish & wildlife agency |
| May 20, 2020 | Rainbow Trout | 3,113 | 3.23" | Montana fish & wildlife agency |
| May 14, 2019 | Rainbow Trout | 3,000 | 2.65" | Montana fish & wildlife agency |
| May 4, 2018 | Rainbow Trout | 3,000 | 2.38" | Montana fish & wildlife agency |
| April 14, 2017 | Rainbow Trout | 3,000 | 2.02" | Montana fish & wildlife agency |
Show 42 more stocking records →
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| April 8, 2016 | Rainbow Trout | 3,000 | 2.09" | Montana fish & wildlife agency |
| April 17, 2015 | Rainbow Trout | 3,000 | 2.04" | Montana fish & wildlife agency |
| April 17, 2014 | Rainbow Trout | 3,000 | 2.1" | Montana fish & wildlife agency |
| June 13, 2013 | Rainbow Trout | 2,994 | 3.05" | Montana fish & wildlife agency |
| May 9, 2012 | Rainbow Trout | 3,000 | 2.71" | Montana fish & wildlife agency |
| June 2, 2011 | Rainbow Trout | 3,000 | 3.36" | Montana fish & wildlife agency |
| May 19, 2010 | Rainbow Trout | 3,000 | 3.59" | Montana fish & wildlife agency |
| April 22, 2009 | Rainbow Trout | 3,010 | 3" | Montana fish & wildlife agency |
| April 23, 2008 | Rainbow Trout | 3,002 | 3.35" | Montana fish & wildlife agency |
| April 17, 2007 | Rainbow Trout | 2,995 | 3.07" | Montana fish & wildlife agency |
| April 27, 2006 | Rainbow Trout | 3,255 | 3.21" | Montana fish & wildlife agency |
| April 25, 2005 | Rainbow Trout | 3,000 | 3.22" | Montana fish & wildlife agency |
| April 26, 2004 | Rainbow Trout | 2,975 | 3.14" | Montana fish & wildlife agency |
| April 28, 2003 | Rainbow Trout | 3,038 | 3.18" | Montana fish & wildlife agency |
| May 1, 2002 | Rainbow Trout | 2,985 | 3.4" | Montana fish & wildlife agency |
| April 26, 2001 | Rainbow Trout | 3,003 | 3" | Montana fish & wildlife agency |
| April 21, 2000 | Rainbow Trout | 3,023 | 3.3" | Montana fish & wildlife agency |
| April 26, 1999 | Rainbow Trout | 3,016 | 3.6" | Montana fish & wildlife agency |
| April 28, 1998 | Rainbow Trout | 883 | 2.9" | Montana fish & wildlife agency |
| April 28, 1998 | Rainbow Trout | 2,118 | 3.9" | Montana fish & wildlife agency |
| April 27, 1997 | Rainbow Trout | 3,028 | 3.3" | Montana fish & wildlife agency |
| April 22, 1996 | Rainbow Trout | 3,350 | 2.6" | Montana fish & wildlife agency |
| April 18, 1995 | Rainbow Trout | 3,103 | 2.9" | Montana fish & wildlife agency |
| April 19, 1994 | Rainbow Trout | 3,010 | 3.1" | Montana fish & wildlife agency |
| April 13, 1990 | Rainbow Trout | 2,500 | 2.8" | Montana fish & wildlife agency |
| May 2, 1989 | Rainbow Trout | 3,133 | 3.6" | Montana fish & wildlife agency |
| April 7, 1988 | Rainbow Trout | 3,024 | 3.4" | Montana fish & wildlife agency |
| April 14, 1987 | Rainbow Trout | 3,006 | 3.3" | Montana fish & wildlife agency |
| May 27, 1986 | Rainbow Trout | 3,045 | 4" | Montana fish & wildlife agency |
| May 4, 1985 | Rainbow Trout | 3,016 | 4" | Montana fish & wildlife agency |
| May 10, 1984 | Rainbow Trout | 3,007 | 4" | Montana fish & wildlife agency |
| May 3, 1983 | Rainbow Trout | 3,016 | 7" | Montana fish & wildlife agency |
| May 3, 1982 | Rainbow Trout | 3,002 | 4" | Montana fish & wildlife agency |
| April 14, 1981 | Rainbow Trout | 3,007 | 4" | Montana fish & wildlife agency |
| May 1, 1980 | Rainbow Trout | 3,489 | 4" | Montana fish & wildlife agency |
| July 2, 1979 | Rainbow Trout | 3,005 | 5" | Montana fish & wildlife agency |
| June 14, 1978 | Rainbow Trout | 3,060 | 5" | Montana fish & wildlife agency |
| April 18, 1977 | Rainbow Trout | 2,508 | 4" | Montana fish & wildlife agency |
| April 21, 1976 | Rainbow Trout | 2,496 | 5" | Montana fish & wildlife agency |
| June 4, 1975 | Rainbow Trout | 2,520 | 5" | Montana fish & wildlife agency |
| May 6, 1974 | Rainbow Trout | 2,520 | 4" | Montana fish & wildlife agency |
| May 1, 1973 | Rainbow Trout | 2,178 | 2" | Montana fish & wildlife agency |
Showing 50 of 55 stocking records.
Frequently asked
When was Hatfield Reservoir last stocked?
According to Montana fish & wildlife agency, Hatfield Reservoir was last stocked June 9, 2025 with Rainbow Trout.
What fish species are stocked in Hatfield Reservoir?
Hatfield Reservoir is stocked with Rainbow Trout.
What time of year is Hatfield Reservoir stocked?
Hatfield Reservoir is typically stocked in spring, most often in April.
How often is Hatfield Reservoir stocked?
Hatfield Reservoir is stocked intermittently — 55 recorded stockings between 1968 and 2025.
How many fish have been stocked in Hatfield Reservoir?
About 154,122 fish have been stocked in Hatfield Reservoir across 55 recorded events since 1968, per Montana fish & wildlife agency.
What size are the fish stocked in Hatfield Reservoir?
Fish stocked in Hatfield Reservoir average about 3.4 inches, based on the sizes the agency reported.
Do you need a fishing license to fish Hatfield 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 Hatfield Reservoir?
Freshly stocked trout in Hatfield 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.