A dry summer is best because it keeps the flowers from going to seed too early, and a wet fall makes sure the seeds will grow at the proper time. A cold harsh winter is ideal because it prevents other plants from germinating and crowding out the wildflowers. A wet spring is essential if the wildflowers are to sprout and grow. Wildflowers start early in the year at the southern and lower elevations and then spread across the state, reaching their peak in April. Generally, the prime months are March, April, and May, with bluebonnets at their peak in April.
Wildflowers continue blooming throughout the year, especially in the higher elevations.
There may also be another spectacular display in the fall after late summer storms. Wildflower peak blooming periods are difficult to predict. It is also hard to know in advance if the season is going to be good at all. Rain and the conditions in the previous year can make a big difference. The hotline is in operation from mid-March to the end of May and will tell you what is blooming throughout Texas.