Some ultras in Northern California (& Nevada) shorter than 100 miles
DateRaceDist.LocationClimb/Descent
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 Lake Sonoma 50m Healdsburg 10500'/10500'
8-Apr-23 Ruck-a-Chuck 50k Foresthill ?'/?'
(9-Apr-22) Diablo Trails Challenge 50k Brentwood ?'/?'
15-Apr-23 SPASM Lake Chabot 50k Castro Valley 2670'/2670'
(16-Apr-22) Woodside Crossover 50k Woodside ?'/?'
16-Apr-23 Napa Valley 50k Calistoga ?'/?'
23-Apr-23 Horseshoe Lake 50k Palo Alto 4560'/4560'
22-Apr-23 Mendocino Coast 50k Mendocino 4708'/4708'
29-Apr-23 The Canyons 50k/100k Foresthill 9200'/9200' - 14000'/14000'
29-Apr-23 Sierra Azul Trail Challenge 50k Los Gatos ?'/?'
6-May-23 Folsom Lake 50k Folsom 2030'/2030'
6-May-23 Miwok Trail 100k Stinson Beach 11628'/11628'
6-May-23 Hacienda Hills Run 50k San Jose ?'/?'
13-May-23 Quicksilver 50k/100k San Jose 6000'/12000'
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 San Francisco 50k/50m Sausalito 9565'/9565'
20-May-23 Silver State 50k/50m Reno, NV 5800'/6100' - 9200'/9200'
21-May-23 Ohlone Wilderness 50k Fremont 8530'/8160'
20-May-23 Bishop High Sierra 50k/50m/100k Bishop ?'/?'
3-Jun-23 Calero Trail Run 50k San Jose ?'/?'
(4-Jun-22) The Loco Challenge 50k/100k Butte Meadows ?'/?'
10-Jun-23 Cinderella 50k Oakland 5495'/5495'
(11-Jun-22) Cool Moon 50m/100k Cool 8000'/11000'
17-Jun-23 SF One Day 6hr/12hr/24hr San Francisco 0'/0'
(18-Jun-22) Headwaters Ultra 56k Mount Shasta 5600'/5600'
8-Jul-23 Rancho Hills Trail Run 50k San Jose ?'/?'
(9-Jul-22) Salt Point 50k Jenner ?'/?'
15-Jul-23 San Lorenzo River 50k Santa Cruz 5175'/5175'
(16-Jul-22) Tahoe Rim Trail 55k/50m Lake Tahoe, NV 6895'/6895' - 9894'/9894'
22-Jul-23 Worth the Hurt 52m San Francisco ?'/?'
22-Jul-23 Kirkwood's Thunder Mountain Trail Challenge 50k Kirkwood ?'/?'
(6-Aug-22) Rodeo Valley 50k Sausalito 6000'/6000'
6-Aug-23 Skyline 50k Castro Valley 4740'/4740'
12-Aug-23 Redwood Trail 50k Oakland 5495'/5495'
19-Aug-23 Tamalpa Headlands 50k Muir Beach 6309'/6309'
19-Aug-23 Headlands 50m/100k Sausalito 11410'/11410'
19-Aug-23 Trail Run at Sly Park 50k Pollock Pines ?'/?'
(21-Aug-21) Golden State 50k Monterey ?'/?'
26-Aug-23 Almaden Hills Trail Run 50k San Jose ?'/?'
(27-Aug-22) Run-de-Vous 14hr San Martin ?'/?'
3-Sep-23 Crystal Springs 50k Woodside 4530'/4530'
9-Sep-23 Mendocino Running Festival 6hr/12hr Mendocino ?'/?'
10-Sep-23 Diablo 50k Clayton 7990'/7990'
(10-Sep-22) Overlook 50k/50m Foresthill ?'/?'
(17-Sep-22) Berkeley Trail Adventure 50k Oakland 4500'/4500'
30-Sep-23 Bay Ridge/Dick Collins 50m/100k Castro Valley 8500'/8500' - 11000'/11000;
8-Oct-23 Spooner's Cove 50k Los Osos 6400'/6400'
(8-Oct-22) Ultra Trails Lake Tahoe (UTLT) 50k/50m Lake Tahoe ?'/?'
14-Oct-23 Ruth Anderson Memorial Endurance Run 50k/50m San Francisco 1450'/1450'
(15-Oct-22) Tahoe Midnight Express 50m/72m So. Lake Tahoe ?'/?'
21-Oct-23 Lake Sonoma 100K 55k/100k Healdsburg ?'/?'
4-Nov-23 Lake Chabot 50k Castro Valley 2670'/2670'
4-Nov-23 Almaden Hills Trail Run 50k San Jose ?'/?'
(5-Nov-22) Rio del Lago 50k Folsom ?'/?'
(12-Nov-22) Mt. Tam 50k Stinson Beach 7000'/7000'
18-Nov-23 Golden Gate(Spartan) 50k/100km San Francisco ?'/?'
(19-Nov-22) Wood-Pur-Lich 40mi Woodside ?'/?'
(19-Nov-22) Trail Run at Sly Park 50k Pollock Pines ?'/?'
25-Nov-23 Quad Dipsea 28.4m Mill Valley 9276'/9276'
2-Dec-23 Calero Trail Run 50k San Jose ?'/?'
(3-Dec-22) San Joaquin River Trail 50km/100km Friant ?'/?'
9-Dec-23 HST Fear & Loathing 50k/50m San Francisco 2739'/2743'
(17-Dec-22) Woodside Ramble 50k Woodside 4530'/4530'
31-Dec-23 New Year's One Day 6hr/12hr/24hr San Francisco 0'/0'
(7-Jan-23) 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'
(28-Jan-23) Fort Ord/Ordnance 50k/100k 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-23) Mt. Umunhum Trail Conquest 50k San Jose ?'/?'
(12-Feb-23) Montara Mountain 50k Pacifica 6700'/6700'
(18-Feb-23) North Marin Ridge Run 50k Lagunitas ?/?
(18-Feb-23) FOURmidable 50k Auburn ?'/?'
(18-Feb-23) Redtail Ridge 50k Castro Valley ?'/?'
(19-Feb-22) Second Saratoga Fat Ass 50k Saratoga ?/?
(25-Feb-23) Salmon Falls 50k Pilot Hill 3500'/3500'
(4-Mar-23) Way Too Cool 50k Cool 6113'/6107'
(11-Mar-23) Marin Ultra Challenge 50k/50m Sausalito 6900'/6900' - 11000'/11000'
(18-Mar-23) Folsom Lake Sweetwater Trail Run 50k Folsom ?'/?'
(25-Mar-23) Montana de Oro 50k Los Osos ?'/?'
(25-Mar-23) South Hills Single Track Trail Run 50k San Jose ?'/?'

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: 3/26/23) StanJ@Run100s.com