Yosemite Travel

Climate
Weather can change rapidly during all seasons of the year, and will also vary greatly with elevation. It will be wise enough to pack for any season with clothing that can be layered, ready to peel off or add on as conditions dictate. Always include some kind of rain gear; the park receives most of its precipitation in the months of January, February and March, but storms are common during the transitional spring and fall seasons, and spectacular thunderstorms may occur during summer.

Get to there
By Car: There are four major entrances into the park. All of these routes are relatively windy mountain roads and appropriate time should be budgeted for them. Warning: There are no gas/petrol stations in the Yosemite Valley!

By plane

There are no landing strips within the park. Airports in surrounding communities include:

Fresno-Yosemite International (FAT), Fresno. Located approximately 1.5 hours (by car) south of the park's entrance on Highway 41.
Merced Airport (MCE), Merced. Located approximately two hours (by car) from Yosemite Valley on Highway 140.
Modesto City-County Airport (MOD), Modesto. Located approximately 1.5 hours (by car) from the park's east entrance on Highway 120.
Stockton Municipal Airport no longer has any commercial flights.

By train
Amtrak offers service to Yosemite by means of a motorcoach bus that meets its San Joaquins trains in Merced. 

 By bus
Many tour bus companies run tours from the Bay Area. Some will just take you to Yosemite Valley; others provide full tours to see the Giant Sequoias and/or Glacier Point.

By shuttle
The Yosemite Area Regional Transportation System (YARTS) [2] offers reasonably-priced transportation into Yosemite Valley from towns east and west of the park including Merced, Mariposa, El Portal, Lee Vining and Mammoth Lakes. Tickets can be purchased ahead of time or from the shuttle driver, and round-trip fares are between $7 (from El Portal) to $20 (from Merced and Mammoth Lakes) into Yosemite Valley. When combined with the free shuttle service that operates within Yosemite Valley, YARTS can eliminate many hassles for summer visitors.

Stay safe
For any emergency in Yosemite National Park, dial 911 from most phones (hotel and retail phones may require 9+911). Yosemite NPS runs its own dedicated emergency dispatch. If you dial from a cell phone, first mention that you are in Yosemite as many cell phones route to a call center in your number's area code

Medical
Yosemite Medical Clinic, Ahwahnee Drive in Yosemite Valley,  +1 209-372-4637. Drop-in and urgent care: 9AM-7PM, 7 days per week, May-September; 9AM-5PM Monday-Friday, October-April. Appointments 8AM-5PM M-F. Routine and emergency medical care, 24-hour paramedic/ambulance services, lab, and Mountain Crisis Services for victims of domestic violence.