Mammoth Lake trout stocking
Westmoreland County, Pennsylvania · lake · 1,013 ft elevation
Mammoth Lake was last stocked 5 months ago (Apr 21, 2026). We have 4 stockings on record since Mar 4, 2026, 3 in the last 12 months. Most stockings come in April. Species stocked: rainbow trout, golden trout.
Next stocking: Tuesday, October 13
- Volunteers meet at Indian Lake at 12:00 PM.
The agency lists these meeting places for volunteers who help carry fish to the water. Dates change with weather and water levels; check the agency's schedule the day before.
- The second most stocked of 19 waters in Westmoreland County.
- Stocked more often than 86% of Pennsylvania waters on our record.
Weather at Mammoth Lake
- Tonight58°FPatchy Drizzle then Patchy Fog10% rain · wind 1 mph
- Tuesday73°FPatchy Fog then Partly Sunny3% rain · wind 2 mph
- Tuesday Night55°FAreas Of Fogwind 1 mph
- Wednesday78°FAreas Of Fog then Mostly Sunnywind 0 to 5 mph
- Wednesday Night61°FPartly Cloudywind 5 mph
- Thursday82°FMostly Sunny1% rain · wind 6 to 14 mph
Forecast from the National Weather Service for this location, refreshed hourly.
When is Mammoth Lake stocked?
Most stockings come in April. Stocked 3 times in 2026, mostly in April, about every 37 days.
By month, all years
What is stocked
| Species | Stockings |
|---|---|
| Rainbow trout | 3 |
| Golden trout | 2 |
Stocking history
20263 stockings · 1 planned
| Date | Species | Since previous | Section and meeting place | Hatchery |
|---|---|---|---|---|
Oct 13Planned Tuesday | Rainbow trout | Meet: Indian Lake, 12:00 PM | Pleasant Gap State Fish Hatchery | |
Apr 21Latest Tuesday | Rainbow trout | 11 days | Meet: Mammoth Dam, 12:15 PM | Pleasant Gap State Fish Hatchery |
Apr 10 Friday | Golden troutRainbow trout | 37 days | Meet: Mammoth Dam, 12:00 PM | Pleasant Gap State Fish Hatchery |
Mar 4 Wednesday | Golden troutRainbow trout | Meet: Mammoth Dam, 12:00 PM | Pleasant Gap State Fish Hatchery |
From Pennsylvania 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: Pennsylvania fishing regulations.
Where is Mammoth Lake?
Westmoreland County, Pennsylvania. The marker is the agency's location for this water; streams are often stocked at several access points.
Stocked waters near Mammoth Lake
- Sewickley Creekstream · 2 mistocked May 4, 2026
- Jacobs Creekstream · 5 mistocked May 1, 2026
- Fourmile Runstream · 6 mistocked Apr 29, 2026
- Donegal Lakelake · 7 mistocked May 4, 2026
- Twin Lakes Number Two Reservoir -upper twin lakelake · 7 mistocked Apr 14, 2026
- Twin Lakes Number One Reservoir - lower twin lakelake · 8 mistocked Apr 21, 2026
- Indian Creekstream · 11 mistocked Apr 8, 2026
- Indian Creekstream · 11 mistocked Apr 8, 2026
All stocked waters in Westmoreland CountyStocked this week in Pennsylvania
Questions about Mammoth Lake
- When was Mammoth Lake last stocked?
- The latest reported stocking was Apr 21, 2026 (rainbow trout), according to Pennsylvania agency reports.
- When is Mammoth Lake stocked next?
- The agency has a stocking scheduled for Oct 13, 2026. Planned dates can shift with weather and water conditions.
- Where do volunteers meet for the next Mammoth Lake stocking?
- Indian Lake at 12:00 PM, on Oct 13, 2026, according to the Pennsylvania stocking schedule, which lists meeting places for volunteers who help carry fish to the water.
- How often is Mammoth Lake stocked?
- Stocked 3 times in 2026, mostly in April, about every 37 days. Across all years on record, most stockings come in April.
- Is Mammoth Lake stocked often?
- The second most stocked of 19 waters in Westmoreland County. Stocked more often than 86% of Pennsylvania waters on our record. We count each day the agency reported stocking it.
- What kind of trout are stocked in Mammoth Lake?
- Rainbow trout (3 stockings); Golden trout (2 stockings).
Stocking schedule from the Pennsylvania Fish and Boat Commission. Dates, sections and meeting places are shown as the Commission publishes them.