Zone 3 · Garden Phlox
Planting Garden Phlox in Zone 3
Phlox paniculata
✅ Garden Phlox 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
July – September
Peak bloom
August
Sun required
full sun, part sun
Mature height
30"
Spacing
18" apart
Type
perennial
How to plant Garden Phlox in zone 3
Plant transplants in spring. Provide good air flow to prevent mildew.
Pair with these for continuous bloom
Garden Phlox peaks in August. These companions keep your bed in color before and after.
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