Forcing Tulips for Summer Bloom: Refrigeration Schedule for June–August Flowers

The Forcing Timeline

Tulips need 12–16 weeks of cold (35–45°F) to bloom. After cold treatment, they flower in 3–4 weeks at 60–65°F.

Schedule for Summer Bloom

Critical Rules

• Use only pre-chilled bulbs or chill yourself in a dedicated fridge (no fruit — ethylene inhibits bloom).
• Plant in pots with well-draining mix; water once, then keep barely moist during chilling.
• After chilling, move to cool, bright spot (55–60°F) until buds show, then warmer.
• Discard bulbs after forcing — they rarely recover.

Practical Note

Forcing for summer is energy-intensive and unreliable for home gardeners. Consider buying potted tulips in spring or planting fall bulbs for natural spring bloom.