• Lassen Peak from Hat Creek

    Lassen Volcanic

    National Park California


Mules ear bloom below Mt. Diller
Mules ear bloom beneath Mt. Diller
NPS Photo

Lassen Volcanic offers spectacular opportunities for wildflower viewing during the summer months. View photos of wildflowers in the park in our wildflowers photo gallery, download a copy of our wildflower guide featuring some of the most commonly sighted wildflowers, or download a copy of the extensive park flora list.

Blooming times vary each year and are greatly affected by the winter's snowpack. Blooming time also varies with each wildflower species. For example, mountain mules ear, snow plant, and western wallflower bloom earlier in the season, while California corn lily and silverleaf lupine tend to bloom later. Below are some rough estimates for wildflower appearance:

Park Area Elevation Range Approximate Season
Warner Valley 5,600 - 6,000' late-May through early July
Manzanita Lake 5,900 - 6,500' late-May through early July
Butte Lake 6,000 - 7,000 June through July
Southwest 6,000 - 7,500' June through July
Summit Lake 6,500 - 7,500' Late-June through early-August
Juniper Lake 6,800 - 8,000' Late-June through early-August
Lassen Peak 7,500 - 8,000' Late-July through September


Did You Know?

View of devastated area from Main Park Road.

The 29 mile Main Park Road was constructed between 1925 and 1931, just 10 years after Lassen Peak erupted. Near Lassen Peak the road reaches 8512 feet, making it the highest road in the Cascade Mountains. It is not unusual for 40 feet of snow to accumulate on the road near Lake Helen.