Texas spans multiple climate zones, from the humid subtropics of the east to the arid deserts of the west, which makes the idea of a fixed spring start date impractical. Winter conditions often fade rapidly, yielding to warmer temperatures. This vastness contributes to unpredictable weather, where cold fronts and warm Gulf air frequently clash.
Defining the Start Date
Spring is officially defined by two systems. The meteorological definition, used for consistent climate tracking, runs from March 1st to May 31st. The astronomical definition begins with the Vernal Equinox, typically around March 20th, marking the moment the sun crosses the celestial equator.
The practical experience in Texas often precedes these dates. South Texas and coastal regions frequently experience consistent spring-like warmth as early as late February, giving them a longer “pre-spring” period. Daytime temperatures in these southern areas can climb into the 70s long before the official start of the season.
Typical Spring Weather Patterns
The core characteristic of Texas spring weather is dramatic temperature fluctuation, often called the “Texas Rollercoaster.” A typical March day might see morning lows in the 50s quickly rising to afternoon highs in the low 70s. This rapid change is driven by the state’s proximity to cold air masses from the north and warm, moist air from the Gulf of Mexico.
As the season progresses, temperatures rise quickly. Central areas see average highs in the low 80s by April, pushing into the upper 80s and even low 90s by May. Humidity begins to climb, especially in East and South Texas. Northern parts of the state maintain more variable temperatures well into May, while southern border areas transition swiftly into near-summer heat. This transition increases atmospheric instability, setting the stage for the severe weather season.
The Peak of Wildflower Season
The most anticipated visual marker of spring is the bloom of the Texas Bluebonnet, the state flower, along with other wildflowers like the vibrant Indian Paintbrush. Central Texas and the Hill Country typically see the most spectacular displays from late March through mid-April.
The exact peak can shift by a couple of weeks each year depending on the winter rainfall and temperatures. Generally, the bloom begins in the southern and eastern parts of the state first, moving northward as the season warms. Locations like the Ennis Bluebonnet Trail and the fields around Washington County are known for their dense concentrations of flowers.
Managing Severe Weather Risks
Spring is the peak season for severe weather, particularly from April through May. The collision of warm, moist air from the Gulf and dry, cooler air from the high plains creates the atmospheric instability necessary for powerful thunderstorms. These storms can produce large hail, damaging straight-line winds, and tornadoes.
The North and Central regions of Texas lie within a historically active area of severe weather often referred to as Tornado Alley. May typically records the highest average number of tornadoes in the state. Preparedness involves monitoring local weather alerts and understanding the difference between a Tornado Watch, meaning conditions are favorable, and a Tornado Warning, meaning a tornado has been sighted or indicated on radar, requiring immediate action.