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Ultra Marathons found in California in December

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Ultra Marathons in California in December 2026

Find A Race is the US's favourite event listings site. Check out our list of December 2026 Ultra Marathons in California below.

Race Calendar: Ultra Marathons found in December

🚀Boosted

Face In Water Endurance Multisport Challenge 2026

San Diego, California
Thu 01 Jan 26 - Thu 31 Dec 26
$54.00
🚀Boosted

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

Friant, California
Sat 05 Dec 26
$59.30 - $165.30
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San Joaquin River Trail 10k/25k/50k

Friant, California
Sat 05 Dec 26
$59.30 - $165.30

New Year's One Day

San Jose, California
Thu 31 Dec 26
$96.40 - $218.30

Face In Water Endurance Multisport Challenge 2026

San Diego, California
Thu 01 Jan 26 - Thu 31 Dec 26
$54.00

Miles For Meals Virtual Triathlon and Virtual Marathon

Sacramento, California
Sun 01 Nov 26 - Tue 01 Dec 26
$96.40 - $107.00
Showing 1-4 of 4 results