If you plant tulips in the spring, you may get flowers, but you may not. The earlier in the spring, the better. We plant them in the fall so they have time to establish roots before getting the cold they need to bloom. So without that head start forming a root system, the tulips planted in the spring may not end up blooming or have less impressive flowers. If you missed your chance in the fall to plant tulips, you can try to plant them as soon as the ground is workable. Or, you can try forcing the bulbs indoors instead. I would suggest that you buy potted tulips from the garden centre instead. Leave them in the pot to enjoy while they bloom, and then once the leaves start to yellow, move them into the ground. They may return the following year!