Spring is the season that follows winter and precedes summer. In the Northern Hemisphere, spring begins on the March equinox (around March 20 or 21) and ends on the June solstice (around June 20 or 21). In the Southern Hemisphere, spring begins on the September equinox (around September 22 or 23) and ends on the December solstice (around December 21 or 22).
The Netherlands is located in the Northern Hemisphere, so spring in the Netherlands begins on the March equinox and ends on the June solstice. This means that spring in the Netherlands lasts from March to May.