Twin Lakes (Mammoth Lakes) Fish Stocking
Mono County, California · 2024–2026 on record · CDFW: Twin Lakes, Mammoth
According to California CDFW — Fish Planting Schedule, Twin Lakes (Mammoth Lakes) (listed by CDFW as Twin Lakes, Mammoth) was last stocked Week of August 23, 2026 with Trout. Twin Lakes (Mammoth Lakes) has 16 stocking records on file, spanning 2024–2026.
When Twin Lakes (Mammoth Lakes) is stocked
Twin Lakes (Mammoth Lakes) is typically stocked in summer, most often in August — 5 stocking events in that peak month.
By species
Angler's Field Guide
Fishing Tips & Stocking Guide for Twin Lakes (Mammoth Lakes)
Practical advice on fish behavior, recommended tackle, and state regulations for anglers fishing in Mono County, California.
Post-Plant Behavior & Timing
Hatchery-raised fish are conditioned to pelleted feed and open raceways. Following a release into Twin Lakes (Mammoth Lakes), 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 Twin Lakes (Mammoth Lakes) was last stocked Week of August 23, 2026, 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 California freshwater fishing license is required for anglers age 16 and older.Purchase California license online →
- •Official Rules & Limits: Bag limits, bait restrictions, and seasonal boundaries are set by California fish & wildlife agency.Official California 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 Twin Lakes (Mammoth Lakes):
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.
Recommended Tackle for Twin Lakes (Mammoth Lakes)
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 Twin Lakes (Mammoth Lakes), freshest activity first.
June Lake
12 miMono County · 1 species · 20 records
Last stocked September 2026
Lake Mary
1 miMono County · 1 species · 16 records
Last stocked September 2026
Convict Creek
9 miMono County · 1 species · 19 records
Last stocked September 2026
Convict Lake
8 miMono County · 1 species · 27 records
Last stocked August 2026
Gull Lake
12 miMono County · 1 species · 16 records
Last stocked August 2026
Lake Mamie
1 miMono County · 1 species · 12 records
Last stocked July 2026
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Source |
|---|---|---|
| Week of August 23, 2026 | Trout | California CDFW |
| Week of July 26, 2026 | Trout | California CDFW |
| Week of May 31, 2026 | Trout | California CDFW |
| Week of May 17, 2026 | Trout | California CDFW |
| Week of October 26, 2025 | Trout | California CDFW |
| Week of October 19, 2025 | Trout | California CDFW |
| Week of September 21, 2025 | Trout | California CDFW |
| Week of August 24, 2025 | Trout | California CDFW |
Show 8 more stocking records →
| Date | Species | Source |
|---|---|---|
| Week of August 3, 2025 | Trout | California CDFW |
| Week of July 27, 2025 | Trout | California CDFW |
| Week of June 22, 2025 | Trout | California CDFW |
| Week of October 20, 2024 | Trout | California CDFW |
| Week of October 13, 2024 | Trout | California CDFW |
| Week of September 22, 2024 | Trout | California CDFW |
| Week of August 25, 2024 | Trout | California CDFW |
| Week of August 11, 2024 | Trout | California CDFW |
The reporting agency did not include fish counts or sizes for this water.
Frequently asked
When was Twin Lakes (Mammoth Lakes) last stocked?
According to California CDFW — Fish Planting Schedule, Twin Lakes (Mammoth Lakes) (listed by CDFW as Twin Lakes, Mammoth) was last stocked Week of August 23, 2026 with Trout.
What fish species are stocked in Twin Lakes (Mammoth Lakes)?
Twin Lakes (Mammoth Lakes) is stocked with Trout.
What time of year is Twin Lakes (Mammoth Lakes) stocked?
Twin Lakes (Mammoth Lakes) is typically stocked in summer, most often in August.
How often is Twin Lakes (Mammoth Lakes) stocked?
Twin Lakes (Mammoth Lakes) has been stocked about 5 times a year — 16 recorded stockings between 2024 and 2026.
Do you need a fishing license to fish Twin Lakes (Mammoth Lakes)?
Yes, all anglers age 16 and older generally need a valid California freshwater fishing license. Always review current regulations from California fish & wildlife agency for site-specific rules, bag limits, or stamps.
How do you catch stocked trout in Twin Lakes (Mammoth Lakes)?
Freshly stocked trout in Twin Lakes (Mammoth Lakes) 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.
What are sterile triploid trout, and why are they stocked in Twin Lakes (Mammoth Lakes)?
Triploid trout are sterile hatchery fish bred with three sets of chromosomes instead of two. Because they do not expend energy developing eggs or milt, they grow significantly faster, live longer to reach trophy sizes, and can be stocked without risking the genetic integrity of native wild trout populations.
Why do fish stocking dates or plant schedules change for Twin Lakes (Mammoth Lakes)?
Stocking schedules published by California CDFW — Fish Planting Schedule are planned targets, not exact guarantees. Plants are frequently delayed or rescheduled due to elevated water temperatures (trout experience mortality stress above 68°F), seasonal runoff, severe weather, poor road access, or hatchery trucking logistics.