Natural Bridge Caverns
Park Large commercial cave complex with guided tours
Show cave near San Antonio offering guided underground tours of stalagmites and stalactites, aboveground zipline and ropes activities, and educational programs for families.
Natural Bridge Caverns is a commercial cave complex in central Texas, near San Antonio. It is the largest show cave operation in Texas and combines underground tours with above-ground visitor attractions.
The caverns were documented and developed for public access in the mid-20th century and opened as a guided-tour attraction; since then the operation has added tour options and surface attractions to broaden visitor offerings.
The caverns lie north of the San Antonio metropolitan area, off regional highways near New Braunfels and the I-35 corridor, making them a common day-trip destination from San Antonio and Austin.
- Tour practicalities: Situated near San Antonio in central Texas and open year-round; guided tours run at regular intervals and typically last about an hour for the standard cavern tour.
- Scale and options: Designated as the largest commercial cavern system in Texas, with both standard show tours and more active spelunking/adventure options for different experience levels.
What to See #
- Show caverns and guided tours: Guided underground routes through the cave passages that showcase large stalactites, stalagmites, and flowstone formations; tour lengths and difficulty vary by route.
- Surface attractions and visitor centre: Outdoor adventure attractions on the surface including a ropes course and canopy/zipline elements, plus a visitor center with exhibits and a gift shop.
How to Get to Natural Bridge Caverns #
The caverns are about 30 miles (48 km) northeast of downtown San Antonio, off I‑35 near the town of San Marcos/Boerne corridor. From San Antonio take I‑35 north to Exit 178 (FM 3009) then follow local signage; ample on‑site parking is available.
Tips for Visiting Natural Bridge Caverns #
- Book cave tours online in advance - popular time slots sell out, especially on weekends and holidays.
- Do the Classic/Discovery Tour first; for more adventurous visitors try the Hidden Passages or the adventure tours that require tight spaces.
- Temperature in the caverns is a constant ~21°C (70°F); bring a light layer for comfort underground.
Best Time to Visit Natural Bridge Caverns #
Cavern tours operate year‑round; visit weekdays or off‑season for smaller groups in the cave and at the surface attractions.
Weather & Climate near Natural Bridge Caverns #
Natural Bridge Caverns's climate is classified as Humid Subtropical - Humid Subtropical climate with hot summers (peaking in July) and cold winters (coldest in January). Temperatures range from 3°C to 34°C. Moderate rainfall (868 mm/year).
January
January is the coolest month with highs of 15°C and lows of 3°C. Moderate rainfall (48 mm).
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February
February is cool with highs of 18°C and lows of 5°C. Moderate rainfall (53 mm).
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March
March is cool with highs of 22°C and lows of 9°C. Moderate rainfall (50 mm).
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April
April is mild with highs of 26°C and lows of 13°C. Moderate rainfall (71 mm).
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May
May is mild with highs of 28°C and lows of 18°C. The wettest month with heavy rain (116 mm).
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June
June is warm with highs of 32°C and lows of 21°C. Significant rainfall (105 mm).
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July
July is the warmest month with highs of 34°C and lows of 22°C. Moderate rainfall (53 mm).
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August
August is warm with highs of 34°C and lows of 22°C. Moderate rainfall (67 mm).
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September
September is warm with highs of 31°C and lows of 19°C. Regular rainfall (94 mm).
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October
October is mild with highs of 26°C and lows of 14°C. Regular rainfall (94 mm).
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November
November is cool with highs of 21°C and lows of 8°C. Moderate rainfall (66 mm).
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December
December is cool with highs of 16°C and lows of 4°C. Moderate rainfall (51 mm).
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