Some ultras in Northern California (& Nevada) shorter than 100 miles
DateRaceDist.LocationClimb/Descent
21-Oct-17 Eldrith Gosney's Pure Ultra 50k Mill valley 6498'/6498'
21-Oct-17 Sac River 55k Redding ?'/?'
4-Nov-17 Lake Chabot 50k Castro Valley 2670'/2670'
11-Nov-17 Mt. Tam 50k Stinson Beach 7000'/7000'
18-Nov-17 Woodside 50k Woodside 4530'/4530'
18-Nov-17 North Face 50k/50m Sausalito ?'/?'
18-Nov-17 Trail Run at Sly Park 50k Pollock Pines ?'/?'
25-Nov-17 Quad Dipsea 28.4m Mill Valley 9276'/9276'
2-Dec-17 Calero Run 50km San Jose ?'/?'
9-Dec-17 HST Fear & Loathing 50k/50m San Francisco 2739'/2743'
9-Dec-17 Rodeo Beach 50k Sausalito 5980'/5980'
10-Dec-17 Spooner's Cove 50k Los Osos 6400'/6400'
16-Dec-17 Woodside Ramble 50k Woodside 4530'/4530'
31-Dec-17 New Year's One Day 6hr/12hr/24hr San Francisco 0'/0'
(1-Jan-17) Woodside 50k Woodside 4530'/4530'
(8-Jan-17) Epiphany Ultra 63k Oakland 2750'/2750'
(14-Jan-17) Fat Ass 50k Saratoga ?
(21-Jan-17) Crystal Springs 50k Woodside 4530'/4530'
(28-Jan-17) Folsom Lake Sweet Water 50k Folsom ?'/?'
3-Feb-18 Fort Ord/Ordnance 50k/100k Monterey ?'/?'
(4-Feb-17) Jed Smith 50k/50m Sacramento 540'/960'
(4-Feb-17) American Canyon 50k Auburn ?'/?'
(11-Feb-17) Golden Gate 50k Rodeo Beach 6320'/6320'
17-Feb-18 Chabot Trail 50k Castro Valley ?'/?'
(18-Feb-17) Montara Mountain 50k Pacifica 6700'/6700'
(18-Feb-17) FOURmidable 50k Auburn ?'/?'
(19-Feb-17) West Coast 50k San Jose 6900'/6900'
(25-Feb-17) Steep Ravine 50k Stinson Beach 5770'/5770'
(25-Feb-17) Salmon Falls 50k Pilot Hill 3500'/3500'
3-Mar-18 Way Too Cool 50k Cool 6113'/6107'
10-Mar-18 Marin Ultra Challenge 50k/50m Sausalito 6900'/6900' - 11000'/11000'
17-Mar-18 4MPH Challenge ? Whiskeytown ?'/?'
(18-Mar-17) San Jose Trail 50k San Jose ?'/?'
(18-Mar-17) Ruck a Chuck 50k Foresthill ?'/?'
(18-Mar-17) Folsom South Side 50k/38mi Folsom ?'/?'
7-Apr-18 American River 50m Sacramento 3474'/2139'
(1-Apr-17) Montana de Oro 50k Los Osos ?'/?'
7-Apr-18 Woodside Crossover 50k Woodside 4610'/4610'
(8-Apr-17) K2 Challenge 6hr Auburn ?'/?'
14-Apr-18 Lake Sonoma 50m Geyserville 10500'/10500'
(15-Apr-17) Diablo Trails Challenge 50k Brentwood ?'/?'
(15-Apr-17) Grizzly Peak 50k Berkeley 6760'/6760'
21-Apr-18 Ruth Anderson Memorial Endurance Run 50k/50m/100k San Francisco 1450'/1450'
21-Apr-18 Mendocino 50k Mendocino 4708'/4708'
(22-Apr-17) Napa Valley 50k Calistoga ?'/?'
(22-Apr-17) Four Falls Fifty K 50k Whiskeytown 7500'/7500'
(22-Apr-17) Razorback 50k/50m/100k San Martin ?'/?'
(22-Apr-17) Mokelumne River 50k/50m Lake Camanche ?'/?'
28-Apr-18 The Canyons 50k/100k Foresthill 9200'/9200' - 14000'/14000'
(29-Apr-17) Folsom Lake 50k Folsom 2030'/2030'
(29-Apr-17) Sierra Azul Trail Challenge 50k Los Gatos ?'/?'
5-May-18 Miwok Trail 100k Stinson Beach 11628'/11628'
5-May-18 Sugarloaf Ridge 50k Santa Rosa 9800'/9800'
(6-May-17) Horseshoe Lake 50k Palo Alto 4560'/4560'
(6-May-17) Armstrong Redwoods 50k Guerneville ?'/?'
(13-May-17) Quicksilver 50k/100k San Jose 6000'/13000'
(13-May-17) Cinderella 50k Oakland 5495'/5495'
(13-May-17) Trail Run at Sly Park 50k Pollock Pines ?'/?'
(13-May-17) Gold Rush 50k Folsom ?'/?'
(14-May-17) Coyote Lake 50k San Martin 3700'/3700'
19-May-18 Silver State 50k/50m Reno, NV 5800'/6100' - 9200'/9200'
20-May-18 Ohlone Wilderness 50k Fremont 8530'/8160'
(20-May-17) San Francisco 50m Sausalito 9565'/9565'
(20-May-17) Ancient Redwood Running Festival 6hr/12hr Philo ?'/?'
(3-Jun-17) Mt. Diablo 50k Clayton ?'/?'
(3-Jun-17) Calero Run 50k/50m San Jose ?'/?'
(4-Jun-17) Big Basin 50k Los Gatos 5790'/5790'
(9-Jun-17) San Francisco Summer Solstice 6hr/12hr/24hr San Francisco 0'/0'
(17-Jun-17) Canyon Meadow 50k Oakland 3812'/3812'
(24-Jun-17) San Lorenzo River 50k Santa Cruz 5175'/5175'
(24-Jun-17) Rodeo Valley 50k Sausalito 6000'/6000'
(1-Jul-17) Lovers Leap of Faith 50k/50m/100k Strawberry ?'/?'/?
(8-Jul-17) Golden Gate 50k Rodeo Beach 6320'/6320'
(8-Jul-17) Pacifica Trail 50k Pacifica ?'/?'
(8-Jul-17) Dirty Dozen 6hr/12hr Pinole ?'/?'
(8-Jul-17) Rancho Run 50k Morgan Hill ?'/?'
(14-Jul-17) Santa Barbara 100k 100k Santa Barbara 13530'/13530'
(15-Jul-17) Santa Barbara Endurance Run 26.25m Santa Barbara 5003'/5937'
(15-Jul-17) Tahoe Rim Trail 55k/50m Lake Tahoe, NV 6895'/6895' - 9894'/9894'
(15-Jul-17) Salt Point 50k Jenner ?'/?'
(16-Jul-17) SPASM Lake Chabot 50k Castro Valley 2670'/2670'
(23-Jul-17) Worth the Hurt 52m San Francisco ?'/?'
(29-Jul-17) Pioneer Spirit 50m Auburn-to-Folsom ?'/?'
(5-Aug-17) Crystal Springs 50k Woodside 4530'/4530'
(5-Aug-17) Sierra Crest 50k Tahoe Donner ?'/?'
(5-Aug-17) Echo Summit Trail Challenge 50k/50m Echo Summit ?'/?'
(6-Aug-17) Skyline 50k Castro Valley 4740'/4740'
11-Aug-18 Trinity Alps 55k Lake Siskiyou ?'/?'
(12-Aug-17) The Ridge 62k Lagunitas ?'/?'
(12-Aug-17) Cinderella 50k Oakland 5495'/5495'
(19-Aug-17) Run-de-Vous 50k/50m San Martin ?'/?'
(19-Aug-17) Robinson Flat 50k Foresthill ?'/?'
25-Aug-18 Tamalpa Headlands 50K 50k Muir Beach 7300'/7300'
(26-Aug-17) Castle Peak 100k Truckee ?'/?'
(26-Aug-17) Almaden Hills 50k San Jose ?'/?'
(27-Aug-17) Diablo 50k Clayton 7990'/7990'
(9-Sep-17) Headlands 50m/75m Sausalito 10034'/10034'
(16-Sep-17) Coastal 50k Stinson Beach 5090'/5090'
(16-Sep-17) Folsom Lake Ultra 110k Auburn 6228'/6228'
(16-Sep-17) Lovers Leap of Faith 50k Strawberry ?'/?'/?
(23-Sep-17) Mount Madonna 50k Watsonville ?'/?'
(23-Sep-17) Berkeley Trail Adventure 50k Oakland 4500'/4500'
(23-Sep-17) Stevens Creek 50k Cupertino 5000'/5000'
(30-Sep-17) Overlook 50k Foresthill ?'/?'
(30-Sep-17) Headwaters Ultra 50k Mount Shasta 5600'/5600'
(7-Oct-17) Bay Ridge Trail 50m/100k Castro Valley ?'/?'
(7-Oct-17) Bizz Johnson 50k Susanville ?'/?'
(7-Oct-17) Skyline to the Sea 50k Saratoga Gap 3000'/3000'
(13-Oct-17) Lake Tahoe 50m/72m So. Lake Tahoe ?'/?'
(14-Oct-17) Coyote Ridge 50k Muir Beach 7130'/7130'
(14-Oct-17) Euchre Bar Massacre 50mi Foresthill 20000'/20000'

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: 10/19/17) StanJ@Run100s.com