Growing Calendar

MenuClose

HomeAboutSearch

When to plant tulips in zone 4a

In zone 4a, where the last spring frost typically comes around May 13, plant August 17 to October 12.

The zone 4a schedule for tulips

Plant for a fall crop
August 17 to October 12

From the median frost dates of the NOAA stations assigned to the 739 ZIP codes in zone 4a, and the timing recommended by Cooperative Extension guides for tulips.

Frost risk in zone 4a

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 4a, the typical last frost ranges from about May 6 in the earliest tenth of ZIP codes to May 24 in the latest tenth, and the first fall frost from September 20 to October 3. For a typical place in the zone:

  • April 30Risky: a later frost happens in 9 years out of 10
  • May 13Typical: frost after this date in half of years
  • May 27Safe: a later frost only 1 year in 10

Your dates for tulips

Set your ZIP code at the top of the page and we will work out when to plant tulips where you live, from the frost records of the nearest NOAA weather station. Your ZIP code is remembered on this device only.

Enter your ZIP code

Tulips in zone 4a cities

CityTypical last frostPlantFall
Fargo, NDMay 10—Aug 19 to Oct 14
Bismarck, NDMay 14—Aug 16 to Oct 11
Grand Forks, NDMay 10—Aug 20 to Oct 15

How to grow tulipsAll zonesTulips in zone 3bTulips in zone 4bAbout zone 4a

Sources