Methods for forcing tulip bulbs include storing unplanted bulbs in the refrigerator or planting several bulbs in a pot and storing them in a cold attic, basement or outdoor area. Both methods involve exposing the bulbs to temperatures between 32 and 50 degrees Fahrenheit for 10 to 16 weeks.
To use the refrigerator chilling method, place bulbs in a breathable bag inside a drawer away from any raw fruits or vegetables. Alternatively, plant bulbs in clay pots, and keep them in a dark room or storage shed. After at least 10 weeks, plant bulbs from the refrigerator, or place potted bulbs in a sunny room with temperatures between 50 and 65 degrees Fahrenheit. Once the tulips have grown a few inches, place them in a sunny and warm area to bloom.