Is it deer resistant?

Yes

Lanceleaf Coreopsis is deer resistant.

Coreopsis lanceolata

Deer: Rarely
Height: 3 ft (91 cm)
Spread: 2 ft (61 cm)
Zones: 4–10
Light: Full sun

Perennial
Wildflower

Lanceleaf Coreopsis (Coreopsis lanceolata)

Photo: iurie.ph · CC0

Also called Lance-Leaved Coreopsis, Longstalk Coreopsis, Sand Coreopsis, Tickseed

Perennial Coreopsis

More details

Light: Full sun, Partial shade
Water: Low, Medium
Type: Perennial, Wildflower
Maintenance: Low, Medium
Growth: Fast
Bloom: Spring, Summer
Foliage: Deciduous
Features: Drought tolerant, Flowering, Native
Best uses: Border, Coastal, Mass planting, Naturalized, Patio, Rock garden

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