- Family: Brushfooted Butterflies (Four-footed Butterflies) – Nymphalidae
- Subfamily: Heliconians (Longwings) – Heliconiinae
- Wing span: Medium-sized, 35–50 mm (1.37–1.95 in.). Females larger than males.
- Wing upper side: Increasingly dark orange towards base, with black blotches. Black marginal stripe on forewing almost unbroken.
- Wing underside: Forewing orange with black blotches and spots. Hind wing divided in two by white or pale yellow strip with dark-edged checks. Inner half rust-red with several light-coloured checks. Rust-red strip on outer side of central strip. Outer part of wing orange with shades of violet. Row of darker spots inside unclear, dark margin stripe.
- Habitat: Bogs. (Absent from drained bogs.)
- Flying time: Southern Finland late May–early July. Northern Finland early–mid-July.
- Overwintering form: Caterpillar.
- Larval foodplant: Cloudberry (Rubus chamaemorus). Caterpillar is a monofag (specialised in one source of nutrition).
- Endangerment: Near threatened.
Frigga’s fritillary can be found in almost all of Finland (apart from the Åland Islands). It is quite rare, especially in the south. Good identifying marks are: 1) the row of black blotches that form a continuous stripe along the edge of the hind wings, 2) the light-coloured central strip on the underside of the hind wings that is surrounded by a rust-red area, and 3) outermost part of hind wings with orange and violet area, with unclear dark spots and dark strip along edge.
Males fly around looking for females. Females lay their eggs individually in moss and other plants close to the larvae’s foodplant.