A grass fire scorched the lower limbs of your Leyland cypresses. Leylands are highly flammable when dry, so you're fortunate the main trunks weren't engulfed.
Burned branches will not re-leaf. Over several years, adjacent limbs may fill the gap. If the main trunk wasn't damaged, the trees will gradually look normal again. Patience is key.

burned Leyland cypress

burned magnolia

burned mulch
White Jelly Blobs on Leyland Cypress: Fungal Issue?
Spittlebugs on Leyland Cypress: Contact Insecticide Before Mid-July
Planting Leyland Cypress: Acidic Soil, Holly-tone, and Split Feeding
Diagnosing Leyland Cypress Decline: Spittlebugs vs. Spider Mites vs. Canker
Leyland Cypress Hedge at Property Line: Root and Sewer Concerns
Leyland Cypress Planted 3 Feet from House: Move It Now
Leyland Cypress Decline: Cankers, Pests, and Professional Diagnosis
Leyland Cypress Browning: Three Canker Diseases Compared
Leyland Cypress Brown Spots: Fungal Cankers and Professional Diagnosis
Cypress 'Golden Leyland': Fast-Growing Golden Column for Screening
Topping Leyland Cypress: Managing Height and Stability in Mature Trees
Leyland Cypress Lifespan: Why Proper Planting & Watering Are Critical
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