Garden Tempo

Tulip bulb planting guide

When to plant tulip bulbs

Plant tulip bulbs in fall, with enough time for roots to establish before the ground freezes. The right week depends on local conditions. Choose a well-drained bed, then use the bulb's size and package instructions to set depth.

Plant for roots before winter Fall planting gives hardy tulip bulbs time to root before spring growth.

Use the ground-freeze window

Pennsylvania example
September to OctoberPenn State uses this local window so bulbs can root before the ground freezes.
Colorado example
September and OctoberColorado State Extension uses the same months for its climate, with rooting before ground freeze as the reason.

Do not copy a calendar across climates

Both examples are regional. The useful decision is to plant in fall before the ground freezes, not to treat one state's month as an exact national date.

Plan the bed before you buy

Tulips need drainage. Illinois and Colorado Extension both warn against waterlogged sites, where bulbs can rot. Pick the bed and check its drainage before choosing quantity or layout.

Open the planting calendarUse the currently supported regional planning tools for your garden. See the source methodUnderstand how Garden Tempo keeps regional timing separate.

Set depth from the bulb

Illinois gives tulips a 4- to 8-inch depth range and advises planting in fall. Penn State uses a general rule of two and one-half to three times the bulb's height. Follow the package when it gives a variety-specific depth, and measure from the bottom of the bulb.

Use the right method for the setting

For an outdoor bed, place the pointed end up and the root base down. Indoor forcing is a different task: Penn State gives tulips a 15- to 17-week chilling period for that method. Do not use an indoor forcing schedule as an outdoor planting date.

Quick questions

Can I plant after a frost?
Use the soil conditionIllinois says many hardy spring bulbs can be planted until the ground is frozen.
Does every bulb use this plan?
NoSummer bulbs and indoor forcing have separate planting conditions.