Skip to content
Editorial standardsAdvertise
MeridiansIndependent reporting, reviews and buying advice
LIVE
Garden/Explainer

When to Plant Fall Bulbs, By Region: The Soil-Temperature Numbers That Matter

Extension offices don't agree on a single calendar date, because the right week depends on local frost timing, not the month on the wall.

Meridians Life Desk

Published 10 September 2026 · Updated 10 September 2026 · 4 min read

When to Plant Fall Bulbs, By Region: The Soil-Temperature Numbers That MatterGarden
Photo: Photo by Karola G / Pexels (Pexels License — free to use, no attribution legally required (credited above as good practice).)

The short answer

  • South Dakota State University Extension recommends planting spring-blooming bulbs from mid-September through mid-October, once nighttime air temperatures settle into the 40s and 50s°F; crocus and daffodil specifically want soil under 60°F.
  • Bulbs need 4 to 6 weeks in the ground before it freezes to grow roots, and should go in 2 to 3 times as deep as the bulb is wide — tulips spaced 4 to 8 inches apart, crocus 3 to 4 inches.
  • NC State Extension, covering a milder region, recommends October through December instead, because bulbs there need 12 to 15 weeks of chilling at 32-45°F to bloom properly — a reminder that the calendar date matters less than local chill-hour math.
  • Store bulbs away from ripening fruit, since the ethylene gas fruit gives off can stop them from flowering, and protect them from squirrels with chicken wire if that's a local problem.

Garden centers are stocking spring bulbs now, and the question every bag of tulips raises is the same: plant them this week, or wait? The honest answer from two state extension offices is that it depends on where you live — not on the date on the calendar.

The rule that matters: soil temperature, not the calendar

South Dakota State University Extension recommends planting from mid-September through mid-October, once nighttime air temperatures settle into the 40s and 50s°F. For crocus and daffodil specifically, it recommends waiting until soil temperature drops below 60°F. Bulbs need 4 to 6 weeks in the ground before the first hard freeze to grow roots before winter dormancy.

Depth and spacing

  • Plant 2 to 3 times as deep as the bulb's diameter
  • Loosen soil to about 12 inches and work in compost first
  • Space tulips 4 to 8 inches apart
  • Space crocus 3 to 4 inches apart

Why the advice looks different in other states

NC State Cooperative Extension, covering a milder climate, recommends planting October through December instead — later, not earlier. The reason is chilling hours: bulbs there need 12 to 15 weeks of temperatures between 32°F and 45°F to bloom properly, and planting too early in a warm fall means that chilling clock starts too soon. NC State also advises storing bulbs away from ripening fruit, since the ethylene gas fruit releases can stop them from flowering, and using chicken wire against squirrels where that's an issue.

Sources

Every factual claim above is traceable to these documents. Check them — that is why they are here.

About this byline

Meridians Life Desk is an editorial desk at Meridians, not an individual. A desk byline means the article was produced and fact-checked to that desk's published standards. Read our editorial standards and corrections policy.

Sponsored

Paid placement · not editorial

Related reading

The Meridians Brief

One considered email a week

What changed, what it costs you, and what to do about it — from the Meridians desks. No sponsored picks disguised as recommendations.

Sign-up opens with our launch issue. Nothing is sent or stored yet.