The wild rhododendrons will bloom in may. Their blooms will last about a month and then they are gone.
The best answer I can offer in 2 parts: 1. whatever that area calls blooming season, as the northern Cali areas tend to be cooler & bloom later. It's best to check the park's website. 2. weather is fickle & "unseasonable" lately, so again check area reports. "Typical" might not be...
The red ones have bloomed. The rest will bloom by April
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