In spring the bulb fields between Leiden and Haarlem turn red, yellow and purple. This route runs from Leiden Centraal through Voorhout to Noordwijkerhout and De Zilk on the edge of the dunes, then back through Lisse, home of Keukenhof gardens, and Sassenheim.
The fields usually flower from late March to early May, with the tulips at their best in April. Keukenhof only opens in spring and you can't ride inside, but there's bike parking at the entrance.
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