I will be in the Netherlands in May, arriving and staying in Haarlem starting on May 15th. So if I want to go to Keukenhof, the only available date would be May 16, which is their closing day.
Obviously closing day won't be peak season, but can I be confident that it will still be worth visiting? And if the weather is rainy that day, I won't have any alternative. How long should I wait to purchase a ticket? Can I buy a ticket the same day? Wake up that morning and decide to go last minute?