Some ultras in Northern California (& Nevada) shorter than 100 miles
DateRaceDist.LocationClimb/Descent
8-Oct-23 Spooner's Cove 50k Los Osos 6400'/6400'
14-Oct-23 Tahoe Midnight Express 50m/72m So. Lake Tahoe ?'/?'
14-Oct-23 Ruth Anderson Memorial Endurance Run 50k/50m San Francisco 1450'/1450'
14-Oct-23 Trail Run at Sly Park 50k Pollock Pines ?'/?'
21-Oct-23 Lake Sonoma 100K 55k/100k Healdsburg ?'/?'
4-Nov-23 Lake Chabot 50k Castro Valley 2670'/2670'
4-Nov-23 Rio 50K 50k Folsom ?'/?'
4-Nov-23 Woodside Trail Run 50k Woodside ?'/?'
4-Nov-23 Almaden Hills Trail Run 50k San Jose ?'/?'
11-Nov-23 Mt. Tam 50k Stinson Beach 7000'/7000'
18-Nov-23 Golden Gate(Spartan) 50k/100km San Francisco ?'/?'
25-Nov-23 Quad Dipsea 28.4m Mill Valley 9276'/9276'
2-Dec-23 San Joaquin River Trail 50km/100km Friant ?'/?'
2-Dec-23 Calero Trail Run 50k San Jose ?'/?'
9-Dec-23 HST Fear & Loathing 50k/50m San Francisco 2739'/2743'
16-Dec-23 Woodside Ramble 50k Woodside 4530'/4530'
31-Dec-23 New Year's One Day 6hr/12hr/24hr San Francisco 0'/0'
6-Jan-24 No Hands 50k American River Canyon ?'/?'
(7-Jan-23) Hacienda Hills Run 50k San Jose ?'/?'
(8-Jan-23) Epiphany Ultra 69k Oakland 2750'/2750'
(12-Jan-23) One Day in Auburn 6hr/12hr/24hr Auburn ?'/?'
(14-Jan-23) Fat Ass 50k Saratoga ?
(15-Jan-23) Crystal Springs 50k Woodside 4530'/4530'
27-Jan-24 Fort Ord 50k Monterey ?'/?'
(28-Jan-23) Folsom Lake Sweetwater Trail Run 50k Folsom ?'/?'
(4-Feb-23) Golden Gate 50k Rodeo Beach 6320'/6320'
(4-Feb-23) Jed Smith 50k/50m Sacramento 540'/960'
4-Feb-24 Giro di Fremont 60k Fremont 4400'/4800'
(4-Feb-23) Mt. Umunhum Trail Conquest 50k San Jose ?'/?'
(12-Feb-23) Montara Mountain 50k Pacifica 6700'/6700'
17-Feb-24 Redtail Ridge 50k Castro Valley ?'/?'
(18-Feb-23) North Marin Ridge Run 50k Lagunitas ?/?
18-Feb-24 Overgrown 50k Los Gatos 6542'/6542'
(18-Feb-23) FOURmidable 50k Auburn ?'/?'
(19-Feb-22) Second Saratoga Fat Ass 50k Saratoga ?/?
25-Feb-24 Las Trampas 50k Castro Valley 10600'/10600
(25-Feb-23) Salmon Falls 50k Pilot Hill 3500'/3500'
(4-Mar-23) Way Too Cool 50k Cool 6113'/6107'
9-Mar-24 Marin Ultra Challenge 50k/50m Sausalito 6900'/6900' - 11000'/11000'
(18-Mar-23) Folsom Lake Sweetwater Trail Run 50k Folsom ?'/?'
(25-Mar-23) South Hills Single Track Trail Run 50k San Jose ?'/?'
30-Mar-24 Montana de Oro 50k Los Osos ?'/?'
(1-Apr-23) American River 50m Sacramento 3474'/2139'
(1-Apr-23) Redwood Trail 50k Oakland 5495'/5495'
(1-Apr-23) Napa Wilderness 50k Napa 6388'/6388'
(1-Apr-23) Folsom Lake Falcon Crest Trail Run 50k Folsom ?'/?'
(8-Apr-23) Ruck-a-Chuck 50k Foresthill ?'/?'
(8-Apr-23) Diablo Trails Challenge 50k Brentwood ?'/?'
13-Apr-24 Lake Sonoma 50m Healdsburg 10500'/10500'
(15-Apr-23) SPASM Lake Chabot 50k Castro Valley 2670'/2670'
(15-Apr-23) Woodside Crossover 50k Woodside ?'/?'
(16-Apr-23) Napa Valley 50k Calistoga ?'/?'
(22-Apr-23) Mendocino Coast 50k Mendocino 4708'/4708'
(23-Apr-23) Horseshoe Lake 50k Palo Alto 4560'/4560'
27-Apr-24 The Canyons 50k/100k Foresthill 9200'/9200' - 14000'/14000'
(29-Apr-23) Sierra Azul Trail Challenge 50k Los Gatos ?'/?'
4-May-24 Miwok Trail 100k Stinson Beach 11628'/11628'
4-May-24 Folsom 54mi Folsom ?'/?'
(6-May-23) Folsom Lake 50k Folsom 2030'/2030'
(6-May-23) Hacienda Hills Run 50k San Jose ?'/?'
11-May-24 Quicksilver 50k/100k San Jose 6000'/13000'
(13-May-23) Grizzly Peak 50k Berkeley 6760'/6760'
(13-May-23) Arnold Rim 35mi Arnold ?'/?'
(13-May-23) Trail Run at Sly Park 50k Pollock Pines ?'/?'
(20-May-23) Silver State 50k/50m Reno, NV 5800'/6100' - 9200'/9200'
(20-May-23) San Francisco 50k/50m Sausalito 9565'/9565'
(20-May-23) Bishop High Sierra 50k/50m/100k Bishop ?'/?'
1-Jun-24 Cool Moon 50m/100k Cool 8000'/11000'
(3-Jun-23) The Loco Challenge 50k/100k Butte Meadows ?'/?'
(3-Jun-23) Calero Trail Run 50k San Jose ?'/?'
(10-Jun-23) Cinderella 50k Oakland 5495'/5495'
(17-Jun-23) SF One Day 6hr/12hr/24hr San Francisco 0'/0'
(17-Jun-23) Headwaters Ultra 56k Mount Shasta 5600'/5600'
(1-Jul-23) Golden State 50k Monterey ?'/?'
(8-Jul-23) Salt Point 50k Jenner ?'/?'
(8-Jul-23) Rancho Hills Trail Run 50k San Jose ?'/?'
(15-Jul-23) Tahoe Rim Trail 55k/50m Lake Tahoe, NV 6895'/6895' - 9894'/9894'
(15-Jul-23) San Lorenzo River 50k Santa Cruz 5175'/5175'
(22-Jul-23) Worth the Hurt 52m San Francisco ?'/?'
(22-Jul-23) Kirkwood's Thunder Mountain Trail Challenge 50k Kirkwood ?'/?'
4-Aug-24 Skyline 50k Castro Valley 4740'/4740'
(5-Aug-23) Rodeo Valley 50k Sausalito 6000'/6000'
(12-Aug-23) Redwood Trail 50k Oakland 5495'/5495'
(12-Aug-23) Rodeo Beach/Headlands 50k/100k Sausalito ?'/?'
17-Aug-24 Tamalpa Headlands 50k Muir Beach 6309'/6309'
(19-Aug-23) Trail Run at Sly Park 50k Pollock Pines ?'/?'
(25-Aug-23) Run-de-Vous 50k/50m/100k San Martin ?'/?'
(26-Aug-23) Almaden Hills Trail Run 50k San Jose ?'/?'
(3-Sep-23) Crystal Springs 50k Woodside 4530'/4530'
(9-Sep-23) Mendocino Running Festival 6hr/12hr Mendocino ?'/?'
(9-Sep-23) The Groves Trail Run 50k Santa Cruz Mtns. ?'/?'
(10-Sep-23) Diablo 50k Clayton 7990'/7990'
(16-Sep-23) Berkeley Trail Adventure 50k Oakland 4500'/4500'
(30-Sep-23) Dick Collins Firetrails 50m Castro Valley 8500'/8500'
(30-Sep-23) Arnold Rim 37m Arnold ?'/?'

Ultras - An ultramarathon is any running event longer than a marathon (i.e. 26.2 miles).
An ultrarun is any unusually difficult running event, regardless of distance (e.g. Pikes Peak Marathon).

"http://www.Run100s.com/sub100.htm" (updated: 10/1/23) StanJ@Run100s.com