Zone 3 · Astilbe
Planting Astilbe in Zone 3
Astilbe × arendsii
✅ Astilbe thrives in zone 3 (hardy 3–8)
Can I plant today?
⏳ Too early to direct-sow
Last frost is in 4 weeks. Wait until soil warms.
Evaluated for April 27, 2026 ·
Zone's last frost
around May 15
Zone's first frost
around September 15
Bloom window
June – July
Peak bloom
June
Sun required
shade, part sun
Mature height
24"
Spacing
18" apart
Type
perennial
How to plant Astilbe in zone 3
Shade garden star. Plant in spring in moist soil. Feathery plumes in early summer. Keep consistently watered.
Pair with these for continuous bloom
Astilbe peaks in June. These companions keep your bed in color before and after.
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