In general, look for mostly golden yellows to dark orange/brown on the black oaks; reds, pinks and yellow on the dogwoods; brilliant yellow on the black cottonwood; and reds, oranges and yellows on shrubs and low-growing herbaceous plants.
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Fall color typically starts late September into early October in Yosemite Valley.
Yosemite is not known for having spectacular fall colors because most of the trees are evergreen. Still, big-leaf maples, black oaks, Pacific dogwoods, and other deciduous trees tend to be showy around mid-October.
Yosemite enthusiasts usually visit the Park during off season months. Fall which starts towards the end of September is one of the best months for hiking and a great time to visit when summer crowds decline dramatically after the Labor Day holiday when children start heading back to school.
October Weather in YosemiteAt relatively low elevations like Wawona or Yosemite Valley, October's high temperatures average around 71°F (22°C). That's a perfect temperature for hiking or rock climbing. However, average nighttime temperatures drop to an average of 51°F (11°C).
One downside: The year-round waterfalls will still be flowing – waterfalls like Vernal, Nevada, and Bridalveil, but unless it's already rained before you arrive, ephemeral waterfalls like the great Yosemite Falls may be dry or barely a trickle.
If you are into light activity and sightseeing, a medium-weight jacket over layers will suffice. Just in case, bring a hat and gloves to ward off the night chill. Day hikers or treaded walking shoes are necessary whether you are walking a valley trail on a ranger-led hike or heading up steeper trails.
Yosemite is home to countless waterfalls. The best time to see waterfalls is during spring, when most of the snowmelt occurs. Peak runoff typically occurs in May or June, with some waterfalls (including Yosemite Falls) often only a trickle or completely dry by August.
Another downside to Yosemite in September is that the waterfalls won't be as full and flourishing. The snow from the previous winter will be all but melted, and with Yosemite's typically dry summers, there will not be very much water to tumble over the cliffs in late summer.
Visiting Yosemite in October means you do not have to reserve an entrance slot for the park. The reservation system begins in May and ends on September 30.
Plan on spending two to four days in Yosemite if you want enough time to see all the amazing sights. This will give you plenty of time to see Half Dome, Yosemite Falls, Glacier Point, and enjoy some hiking trails.
Plan trips during the mid-week - Yosemite Valley is most popular on weekends and holidays, which can mean significant traffic congestion, especially on Saturdays. To avoid crowds, consider planning a trip to Yosemite Monday through Thursday.
The cool season lasts for 3.1 months, from November 21 to February 25, with an average daily high temperature below 61°F. The coldest month of the year in Yosemite Lakes is December, with an average low of 38°F and high of 54°F.