Some ultras in Northern California (& Nevada) shorter than 100 miles
DateRaceDist.LocationClimb/Descent
28-May-22 Lake Sonoma 100K 100m Healdsburg ?'/?'
4-Jun-22 Calero Trail Run 50k San Jose ?'/?'
(5-Jun-21) The Loco Challenge 50k/100k Butte Meadows ?'/?'
(5-Jun-21) Ruck a Chuck 50k Foresthill ?'/?'
11-Jun-22 Napa Wilderness 50k Napa 6388'/6388'
11-Jun-22 Cool Moon 50m/100k Cool 8000'/11000'
11-Jun-22 Cinderella 50k Oakland 5495'/5495'
18-Jun-22 San Lorenzo River 50k Santa Cruz 5175'/5175'
18-Jun-22 Headwaters Ultra 56k Mount Shasta 5600'/5600'
9-Jul-22 SF One Day 6hr/12hr/24hr San Francisco 0'/0'
9-Jul-22 Rancho Hills Trail Run 50k San Jose ?'/?'
16-Jul-22 Tahoe Rim Trail 55k/50m Lake Tahoe, NV 6895'/6895' - 9894'/9894'
(17-Jul-21) Salt Point 50k Jenner ?'/?'
23-Jul-22 Kirkwood's Thunder Mountain Trail Challenge 50k Kirkwood ?'/?'
6-Aug-22 Redwood Trail 50k Oakland 5495'/5495'
6-Aug-22 Rodeo Valley 50k Sausalito 6000'/6000'
7-Aug-22 Skyline 50k Castro Valley 4740'/4740'
14-Aug-22 Castle Peak 100k Truckee ?'/?'
20-Aug-22 Headlands 50m/100k Sausalito 11410'/11410'
20-Aug-22 Sly Park Lake Trail Run 50k Pollock Pines ?'/?'
(21-Aug-21) Golden State 50k Monterey ?'/?'
27-Aug-22 Almaden Hills Trail Run 50k San Jose ?'/?'
3-Sep-22 Bizz Johnson 50k Susanville ?'/?'
10-Sep-22 Mendocino Running Festival 6hr/12hr Mendocino ?'/?'
(11-Sep-21) Overlook 50k/50m Foresthill ?'/?'
17-Sep-22 Berkeley Trail Adventure 50k Oakland 4500'/4500'
18-Sep-22 Diablo 50k Clayton 7990'/7990'
(18-Sep-21) Golden Gate 50k/100km San Francisco ?'/?'
(18-Sep-21) Worth the Hurt 52m San Francisco ?'/?'
24-Sep-22 Bay Ridge/Dick Collins 50m/100k Castro Valley 8500'/8500' - 11000'/11000;
(25-Sep-21) Ultra Trails Lake Tahoe (UTLT) 50k/50m Lake Tahoe ?'/?'
(2-Oct-21) No'to'mom 50k/100k Sacramento ?'/?'
8-Oct-22 Ruth Anderson Memorial Endurance Run 50k/50m San Francisco 1450'/1450'
(9-Oct-21) Tahoe Midnight Express 50m/72m So. Lake Tahoe ?'/?'
15-Oct-22 Euchre Bar Massacre 50mi Foresthill 20000'/20000'
16-Oct-22 Spooner's Cove 50k Los Osos 6400'/6400'
(23-Oct-21) Quicksilver 50k/100k San Jose 6000'/12000'
5-Nov-22 Lake Chabot 50k Castro Valley 2670'/2670'
5-Nov-22 Almaden Hills Trail Run 50k San Jose ?'/?'
(6-Nov-21) Woodside 50k Woodside 4530'/4530'
(7-Nov-21) Whiskey Hill 50k Woodside ?'/?'
12-Nov-22 Mt. Tam 50k Stinson Beach 7000'/7000'
19-Nov-22 Sly Park Lake Trail Run 50k Pollock Pines ?'/?'
26-Nov-22 Quad Dipsea 28.4m Mill Valley 9276'/9276'
(27-Nov-21) Napa Valley 50k Calistoga ?'/?'
3-Dec-22 Calero Trail Run 50k San Jose ?'/?'
4-Dec-22 HST Fear & Loathing 50k/50m San Francisco 2739'/2743'
(4-Dec-21) San Joaquin River Trail 50km/100km Friant ?'/?'
(11-Dec-21) Rodeo Beach 50k Sausalito 5980'/5980'
(18-Dec-21) Woodside Ramble 50k Woodside 4530'/4530'
(31-Dec-21) New Year's One Day 6hr/12hr/24hr San Francisco 0'/0'
(1-Jan-22) Hacienda Hills Run 50k San Jose ?'/?'
(9-Jan-22) Epiphany Ultra 69k Oakland 2750'/2750'
(15-Jan-22) Fat Ass 50k Saratoga ?
(15-Jan-22) One Day in Auburn 6hr/12hr/24hr Auburn ?'/?'
16-Jan-22 Crystal Springs 50k Woodside 4530'/4530'
(22-Jan-22) No Hands 50k American River Canyon ?'/?'
(29-Jan-22) Folsom Lake Sweetwater Trail Run 50k Folsom ?'/?'
(5-Feb-22) Jed Smith 50k/50m Sacramento 540'/960'
(5-Feb-22) Golden Gate 50k Rodeo Beach 6320'/6320'
(5-Feb-22) Fort Ord/Ordnance 50k/100k Monterey ?'/?'
(5-Feb-22) Mt. Umunhum Trail Conquest 50k San Jose ?'/?'
(13-Feb-22) Montara Mountain 50k Pacifica 6700'/6700'
(19-Feb-22) Second Saratoga Fat Ass 50k Saratoga ?/?
(19-Feb-22) FOURmidable 50k Auburn ?'/?'
(26-Feb-22) Salmon Falls 50k Pilot Hill 3500'/3500'
(5-Mar-22) Way Too Cool 50k Cool 6113'/6107'
(5-Mar-22) Montana de Oro 50k Los Osos ?'/?'
(12-Mar-22) Marin Ultra Challenge 50k/50m Sausalito 6900'/6900' - 11000'/11000'
(19-Mar-22) Pioneer Spirit 50m Auburn-to-Folsom ?'/?'
(19-Mar-22) Wood-Pur-Lich 40mi Woodside ?'/?'
(19-Mar-22) Folsom Lake Southside Trail Run 50k Folsom ?'/?'
(26-Mar-22) South Hills Single Track Trail Run 50k San Jose ?'/?'
1-Apr-23 American River 50m Sacramento 3474'/2139'
(2-Apr-22) Redwood Trail 50k Oakland 5495'/5495'
(2-Apr-22) Santa Clarita 50k Santa Clarita ?'/?'
(2-Apr-22) Folsom Lake Falcon Crest Trail Run 50k Folsom ?'/?'
8-Apr-23 Lake Sonoma 50m Healdsburg 10500'/10500'
(9-Apr-22) Diablo Trails Challenge 50k Brentwood ?'/?'
(16-Apr-22) SPASM Lake Chabot 50k Castro Valley 2670'/2670'
(16-Apr-22) Woodside Crossover 50k Woodside ?'/?'
(23-Apr-22) Mendocino Coast 50k Mendocino 4708'/4708'
(23-Apr-22) The Canyons 50k/100k Foresthill 9200'/9200' - 14000'/14000'
(23-Apr-22) Arnold Rim 35mi Arnold ?'/?'
(30-Apr-22) Folsom Lake 50k Folsom 2030'/2030'
(30-Apr-22) Sierra Azul Trail Challenge 50k Los Gatos ?'/?'
21-May-23 Ohlone Wilderness 50k Fremont 8530'/8160'
(1-May-22) Horseshoe Lake 50k Palo Alto 4560'/4560'
6-May-23 Miwok Trail 100k Stinson Beach 11628'/11628'
(7-May-22) Hacienda Hills Run 50k San Jose ?'/?'
13-May-23 Quicksilver 50k/100k San Jose 6000'/12000'
(14-May-22) Sly Park Lake Trail Run 50k Pollock Pines ?'/?'
(14-May-22) Grizzly Peak 50k Berkeley 6760'/6760'
(21-May-22) Silver State 50k/50m Reno, NV 5800'/6100' - 9200'/9200'
(21-May-22) Bishop High Sierra 50k/50m/100k Bishop ?'/?'
(21-May-22) San Francisco 50k/50m Sausalito 9565'/9565'

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: 5/24/22) StanJ@Run100s.com