Some ultras in Northern California (& Nevada) shorter than 100 miles
DateRaceDist.LocationClimb/Descent
3-Dec-16 North Face 50k/50m Sausalito ?'/?'
4-Dec-16 HST Fear & Loathing 50k/50m San Francisco 2739'/2743'
3-Dec-16 Calero Run 50km San Jose ?'/?'
10-Dec-16 Rodeo Beach 50k Sausalito 5980'/5980'
11-Dec-16 Spooner's Cove 50k Los Osos 6400'/6400'
17-Dec-16 Woodside Ramble 50k Woodside 4530'/4530'
31-Dec-16 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 ?
14-Jan-17 Steep Ravine 50k Stinson Beach 5770'/5770'
14-Jan-17 Pacifica Foothills 50k Pacifica 7090'/7090'
21-Jan-17 Crystal Springs 50k Woodside 4530'/4530'
28-Jan-17 Folsom Lake Sweet Water 50k Folsom ?'/?'
4-Feb-17 Jed Smith 50k/50m Sacramento 540'/960'
4-Feb-17 Fort Ord/Ordnance 50k/100k Monterey ?'/?'
11-Feb-17 Golden Gate 50k Rodeo Beach 6320'/6320'
(6-Feb-16) American Canyon 50k Auburn ?'/?'
18-Feb-17 Montara Mountain 50k Pacifica 6700'/6700'
18-Feb-17 Chabot Trail 50k Castro Valley ?'/?'
25-Feb-17 Salmon Falls 50k Pilot Hill 3500'/3500'
4-Mar-17 Way Too Cool 50k Cool 6113'/6107'
(5-Mar-16) Razorback 50k/50m San Martin ?'/?'
11-Mar-17 Marin Ultra Challenge 50k/50m Sausalito 6900'/6900' - 11000'/11000'
18-Mar-17 4MPH Challenge ? Whiskeytown ?'/?'
1-Apr-17 American River 50m Sacramento 3474'/2139'
15-Apr-17 Lake Sonoma 50m Geyserville 10500'/10500'
15-Apr-17 Grizzly Peak 50k Berkeley 6760'/6760'
15-Apr-17 Woodside Crossover 50k Woodside 4610'/4610'
(16-Apr-16) Diablo Trails Challenge 50k Brentwood ?'/?'
22-Apr-17 Ruth Anderson Memorial Endurance Run 50k/50m/100k San Francisco 1450'/1450'
22-Apr-17 Mendocino 50k Mendocino 4708'/4708'
22-Apr-17 Four Falls Fifty K 50k Whiskeytown 7500'/7500'
29-Apr-17 The Canyons 50k/100k Foresthill 9200'/9200' - 14000'/14000'
29-Apr-17 Folsom Lake 50k Folsom 2030'/2030'
(30-Apr-16) Sierra Azul Trail Challenge 50k Los Gatos ?'/?'
(1-May-16) Leoni Meadows 50k Grizzly Flats ?'/?'
6-May-17 Miwok Trail 100k Stinson Beach 11628'/11628'
6-May-17 Horseshoe Lake 50k Palo Alto 4560'/4560'
(7-May-16) Armstrong Redwoods 50k Guerneville ?'/?'
13-May-17 Quicksilver 50k/100k San Jose 6000'/13000'
13-May-17 Cinderella 50k Oakland 5495'/5495'
(14-May-16) Gold Rush 50k/100k Folsom ?'/?'
(14-May-16) Run in the Pines 50k/50m Pollock Pines ?'/?'
20-May-17 San Francisco 50m Sausalito 9565'/9565'
(21-May-16) Silver State 50k/50m Reno, NV 5800'/6100' - 9200'/9200'
21-May-17 Ohlone Wilderness 50k Fremont 8530'/8160'
4-Jun-17 Big Basin 50k Los Gatos 5790'/5790'
(4-Jun-16) Calero Run 50k/50m San Jose ?'/?'
10-Jun-17 Rodeo Valley 50k Sausalito 6000'/6000'
(11-Jun-16) Rim to Rim 50k/50m Chico 5200'/8400'
17-Jun-17 Canyon Meadow 50k Oakland 3812'/3812'
25-Jun-17 San Lorenzo River 50k Santa Cruz 5175'/5175'
(2-Jul-16) Lovers Leap of Faith 50k/50m/100k Kyburz ?'/?'/?
8-Jul-17 Golden Gate 50k Rodeo Beach 6320'/6320'
(9-Jul-16) Dirty Dozen 6hr/12hr Pinole ?'/?'
(10-Jul-16) Pacifica 50k Pacifica ?'/?'
14-Jul-17 Santa Barbara 100k 100k Santa Barbara, CA 13530'/13530'
15-Jul-17 Santa Barbara Endurance Run 26.25m Santa Barbara, CA 5003'/5937'
15-Jul-17 Tahoe Rim Trail 55k/50m Lake Tahoe, NV 6895'/6895' - 9894'/9894'
16-Jul-17 SPASM Lake Chabot 50k Castro Valley 2670'/2670'
(16-Jul-16) Rancho Run 50k Morgan Hill ?'/?'
(23-Jul-16) Salt Point 50k Jenner ?'/?'
(31-Jul-16) Worth the Hurt 52m San Francisco ?'/?'
5-Aug-17 Crystal Springs 50k Woodside 4530'/4530'
(6-Aug-16) The Diamond S Ranch 50k/100km Truckee ?'/?'
(6-Aug-16) Echo Summit Trail Challenge 50k/50m Echo Summit ?'/?'
12-Aug-17 Cinderella 50k Oakland 5495'/5495'
13-Aug-17 Skyline 50k Castro Valley 4740'/4740'
(13-Aug-16) Cool Moon 50m/100k Cool ?'/?'
(20-Aug-16) Run-de-Vous 50k/50m San Martin ?'/?'
26-Aug-17 Tamalpa Headlands 50K 50k Muir Beach 7300'/7300'
27-Aug-17 Diablo 50k Clayton 7990'/7990'
(27-Aug-16) Castle Peak 100k Truckee ?'/?'
(27-Aug-16) Almaden Hills 50k San Jose ?'/?'
(10-Sep-16) Headlands 50m/75m Sausalito 10034'/10034'
(11-Sep-16) Robinson Flat 50k Foresthill ?'/?'
16-Sep-17 Coastal 50k Stinson Beach 5090'/5090'
(17-Sep-16) Lovers Leap of Faith 50k/50mi/100km Kyburz ?'/?'/?
(24-Sep-16) UROC 50k-100k Auburn 3067'/3046' - 11463'/11442'
(24-Sep-16) Stevens Creek 50k Cupertino 5000'/5000'
(24-Sep-16) Berkeley Trail Adventure 50k Oakland 4500'/4500'
(1-Oct-16) Folsom Lake Ultra 100k Auburn 6228'/6228'
(1-Oct-16) Headwaters Ultra 50k Mount Shasta 5600'/5600'
7-Oct-17 Bizz Johnson 50k Susanville ?'/?'
(8-Oct-16) Dick Collins' Firetrails 50m Castro Valley 7820'/7840'
(8-Oct-16) Bishop High Sierra 55k/100k Bishop ?'/?'
(8-Oct-16) Skyline to the Sea 50k Saratoga Gap 3000'/3000'
(8-Oct-16) Lake Tahoe 50m/72m So. Lake Tahoe ?'/?'
15-Oct-17 Coyote Ridge 50k Muir Beach 7130'/7130'
(15-Oct-16) Overlook 50k Auburn ?'/?'
(15-Oct-16) Euchre Bar Massacre 50mi Foresthill 20000'/20000'
(22-Oct-16) Eldrith Gosney's Pure Ultra 50k Mill valley 6498'/6498'
4-Nov-17 Lake Chabot 50k Castro Valley 2670'/2670'
(12-Nov-16) Mt. Tam 50k Stinson Beach 7000'/7000'
(12-Nov-16) Run in the Pines 50k Pollock Pines ?'/?'
25-Nov-17 Quad Dipsea 28.4m Mill Valley 9276'/9276'

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: 12/3/16) StanJ@Run100s.com