Clodius Parnassian
Parnassius clodius

Family: Papilionidae

Size: 50 – 80 mm
Best Viewing months: June – July

Anise Swallowtail
Papilio zelicaon

Family: Papilionidae

Size: 60 – 95 mm
Best Viewing months: May – August

Western Tiger Swallowtail
Papilio rutulus

Family: Papilionidae

Size: 75 – 105 mm
Best Viewing months: May – August

Pale Tiger Swallowtail
Papilio eurymedon

Family: Papilionidae

Size: 75 – 110 mm
Best Viewing months: May – June

Pine White
Neophasia menapia

Family: Pieridae

Size: 45 – 55 mm
Best Viewing months: August – September

Margined White
Pieris marginalis

Family: Pieridae

Size: 40 – 50 mm
Best Viewing months: April – August

Cabbage White
Pieris rapae

Family: Pieridae

Size: 35 – 50 mm
Best Viewing months: March – October

Sara Orangetip
Anthocharis sara

Family: Pieridae

Size: 40 – 45 mm
Best Viewing months: March – May

Orange Sulphur
Colias eurytheme

Family: Pieridae

Size: 35 – 60 mm
Best Viewing months: June – September

Purplish Copper
Lycaena helloides

Family: Lycaenidae

Size: 25 – 35 mm
Best Viewing months: June – September

Mariposa Copper
Lycaena mariposa

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: July – August

Cedar Hairstreak
Callophrys nelsoni

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: May – June

Western Elfin
Callophrys iroides

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: April – May

Moss's Elfin
Callophrys mossii

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: March – May

Western Pine Elfin
Callophrys eryphon

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: April – May

Grey Hairstreak
Strymon melinus

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: May – August

Western Tailed Blue
Cupido amyntula

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: May

Western Spring Azure
Celastrina echo

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: April – June

Silvery Blue
Glaucopsyche lygdamus

Family: Lycaenidae

Size: 25 – 30 mm
Best Viewing months: April – June

Anna's Blue
Plebejus anna

Family: Lycaenidae

Size: 30 – 35 mm
Best Viewing months: July – August

Boisduval's Blue
Plebejus icarioides

Family: Lycaenidae

Size: 25 – 35 mm
Best Viewing months: June – July

Hydaspe Fritillary
Speyeria hydaspe

Family: Nymphalidae

Size: 45 – 60 mm
Best Viewing months: June – July

Western Meadow Fritillary
Boloria epithore

Family: Nymphalidae

Size: 40 mm
Best Viewing months: June – August

Field Crescent
Phyciodes pulchella

Family: Nymphalidae

Size: 35 – 40 mm
Best Viewing months: June – July

Mylitta Crescent
Phyciodes mylitta

Family: Nymphalidae

Size: 35 mm
Best Viewing months: April – July

Satyr Comma
Polygonia satyrus

Family: Nymphalidae

Size: 40 – 55 mm
Best Viewing months: March – September

Green Comma
Polygonia faunus

Family: Nymphalidae

Size: 40 – 50 mm
Best Viewing months: April – July

Hoary Comma
Polygonia gracilis

Family: Nymphalidae

Size: 40 – 50 mm
Best Viewing months: April – September

California Tortoiseshell
Nymphalis californica

Family: Nymphalidae

Size: 50 – 60 mm
Best Viewing months: April – May 

Mourning Cloak
Nymphalis antiopa

Family: Nymphalidae

Size: 50 – 75 mm
Best Viewing months: March – September

Milbert's Tortoiseshell
Aglais milberti

Family: Nymphalidae

Size: 40 – 55 mm
Best Viewing months: April – August

Painted Lady
Vanessa cardui

Family: Nymphalidae

Size: 50 – 70 mm
Best Viewing months: May – September

West Coast Lady
Vanessa annabella

Family: Nymphalidae

Size: 40 – 55 mm
Best Viewing months: May – September

American Painted Lady
Vanessa virginiensis

Family: Nymphalidae

Size: 40 – 60 mm
Best Viewing months: August – September

Red Admiral
Vanessa atalanta

Family: Nymphalidae

Size: 50 – 60 mm
Best Viewing months: May – September

Lorquin's Admiral
Limenitis lorquini

Family: Nymphalidae

Size: 50 – 70 mm
Best Viewing months: June – August

Ringlet
Coenonympha tullia

Family: Nymphalidae

Size: 30 – 40 mm
Best Viewing months: May – August

Common Wood Nymph
Cercyonis pegala

Family: Nymphalidae

Size: 50 – 60 mm
Best Viewing months: July – August

Great Arctic
Oeneis nevadensis

Family: Nymphalidae

Size: 55 – 65 mm
Best Viewing months: June – July

Propertius Duskywing
Erynnis propertius

Family: Hesperiidae

Size: 35 – 45 mm
Best Viewing months: April – June

Persius Duskywing
Erynnis persius

Family: Hesperiidae

Size: 25 – 35 mm
Best Viewing months: May – July

Arctic Skipper
Carterocephalus palaemon

Family: Hesperiidae

Size: 20 – 30 mm
Best Viewing months: May – July

Essex Skipper
Thymelicus lineola

Family: Hesperiidae

Size: 20 – 25 mm
Best Viewing months: June – July

Common Branded Skipper
Hesperia comma

Family: Hesperiidae

Size: 25 – 30 mm
Best Viewing months: July – August

Woodland Skipper
Ochlodes sylvanoides

Family: Hesperiidae

Size: 25 – 30 mm
Best Viewing months: July – September

Dun Skipper
Euphyes vestris

Family: Hesperiidae

Size: 25 – 30 mm
Best Viewing months: June – July