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Boulder County, Colorado trout stocking

Colorado stocks 17 waters in Boulder County (17 lakes and ponds). The most recent stocking was Barker Reservoir, 4 months ago (Jun 12, 2026). Most stockings here come in March to April and October.

When Boulder County is stocked

JanFeb: 8 stocking days8FebMar: 27 stocking days27MarApr: 43 stocking days43AprMay: 20 stocking days20MayJun: 16 stocking days16JunJul: 1 stocking days1JulAug: 1 stocking days1AugSep: 14 stocking days14SepOct: 35 stocking days35OctNov: 8 stocking days8NovDec: 1 stocking days1Dec
Stocking days in Boulder County by month, all years on record. This month is shown in blue.

Stocked waters in Boulder County

WaterTypeLast stockedOn recordSpecies
Barker ReservoirlakeJun 12, 202613
Lagerman ReservoirlakeJun 5, 20261
McCall LakelakeJun 5, 202634
Thomas ReservoirlakeMay 22, 202629
Waneka LakelakeMay 1, 202614
KOA Lake - BoulderlakeApr 3, 202613
Harper LakelakeMar 13, 202610
Viele LakelakeFeb 26, 202613
Park LakelakeOct 31, 20252
Izaak Walton Longmont PondpondOct 3, 202520
Klubert-Warembourg PondpondOct 3, 20252
Erie LakelakeOct 4, 20242
Red Rock LakelakeJun 23, 20238
Wonderland LakelakeApr 21, 20206
Dorothy LakelakeJun 18, 20193
Thunderbird LakelakeNov 10, 20172
Gross ReservoirlakeOct 25, 20162

Other Colorado counties

Stocking report from Colorado Parks and Wildlife, which lists the waters stocked with catchable trout (about 10 inches) in the week before each report. Locations from the Colorado Fishing Atlas.