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Ultra Marathons found in California in December

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Ultra Marathons in California in December 2025

Find A Race is the US's favourite event listings site. Check out our list of December 2025 Ultra Marathons in California below.

Race Calendar: Ultra Marathons found in December

🚀Boosted

San Joaquin River Trail 10k/25k/50k

Friant, California
06 Dec 25
$48.70 - $133.50
🚀Boosted

Malibu to Tahoe Annual Challenge

Anywhere, California
01 Jan 24 - 31 Dec 25
$53.75
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San Joaquin River Trail 10k/25k/50k

Friant, California
06 Dec 25
$48.70 - $133.50

Malibu to Tahoe Annual Challenge

Anywhere, California
01 Jan 24 - 31 Dec 25
$53.75
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