Yosemite is magnificent in every possible season, it’s literally impossible to make a bad pick. That said, there are unique aspects to each season.
My first choice is fall, hands down – October and November in particular when the leaves are changing colors, the temperatures are mild to cool, and the crowds are minimal. It’s like some magical Tolkien Middle Earth Elvin land, with the only possible downside a potentially dry Yosemite Falls (Bridalveil Fall typically flows year around).
Close behind is spring, April to early June, before the summer masses show up, but the water falls are pounding, the trees have their leaves back, the meadows are green with blooming wildflowers, and my favorite of May – Dogwood blossoms!
Then there is winter – rain and snow are common, but that means rain and snow are common! Weather, low hanging clouds clinging to the cliffs, all that moody atmosphere makes for an amazing space. Don’t sell winter short, even if it’s cold, it’s beautiful.
Finally, that leaves summer – clear blue skies with afternoon thunderheads, green meadows, the falls may be dwindling, or they might not. The summer brings the crowds, sunrise weddings are the rule of the day, but if you find a weekday sunrise to celebrate your elopement, you’ll be rewarded with a quiet, stunningly beautiful scene.
Note, if you’re looking to access the high country – Glacier Point, Taft Point, Tuolumne Meadows, Tenaya Lake, Olmstead Point, or other locations along Tioga Pass Rd, you’ll want to look at June through late October-ish as they’re inaccessible after the snow begins to accumulate.