The blaze, dubbed the Blue Fire, broke out around 11:50 a.m. off the northbound 15 Freeway near Cleghorn Road, according to the San Bernardino National Forest.
Officials said the flames had the potential to burn 30-40 acres, and by 3 p.m., the fire was 40% contained. Fire crews were expected to remain on scene into the evening.
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No evacuations or injuries have been reported, but some lane closures are in effect on the freeway.
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The cause of the fire is under investigation.
DEVELOPING: We will add more details to this report as they become available.