When to Plant Leaf Lettuce in Boulder, Colorado (80310)
Location
Boulder, Colorado
ZIP Code
80310
USDA Zone
6a
Last Frost
Monday, April 20, 2026
📅 Planting Calendar
Direct Sow Outdoors Monday, March 9, 2026
Pro Tip: Leaf Lettuce can be directly sown outdoors. Plant 6 weeks before your last frost date.
🌿 Plant Details
Scientific Name Lactuca sativa
Days to Maturity 7 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 1-7 days
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Growing Leaf Lettuce in Zone 6a
Leaf Lettuce (Lactuca sativa) is a popular garden vegetable. In Boulder, Colorado, which is in USDA Hardiness Zone 6a, you should direct sow seeds around Monday, March 9, 2026.
Your average last frost date is Monday, April 20, 2026. Leaf Lettuce grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.