The 5 USDA planting zones in Orange County, California are Zone 8b, Zone 9a, Zone 9b, Zone 10a, and Zone 10b, as declared by USDA in latest update of 2023. The 5 planting zones in Orange County, California are listed below.
- Zone 8b: Zone 8b experiences minimum temperatures of 15°F to 20°F (-9.4°C to -6.7°C) and covers small high-elevation areas in eastern Orange County and is the coolest planting zone in the region.
- Zone 9a: Zone 9a has minimum temperatures of 20°F to 25°F (-6.7°C to -3.9°C) and is found in eastern inland areas of Orange County.
- Zone 9b: Zone 9b sees minimum temperatures of 25°F to 30°F (-3.9°C to -1.1°C) and spans northeastern Orange County and inland valleys.
- Zone 10a: Zone 10a ranges from 30°F to 35°F (-1.1°C to 1.7°C), covering cities like Brea, Cypress, and Laguna Beach. This zone covers large areas of northern and coastal Orange County.
- Zone 10b: Zone 10b features mild minimum temperatures of 35°F to 40°F (1.7°C to 4.4°C), including Anaheim, Irvine, and Newport Beach. This is Orange County’s warmest zone, covering most of the central and coastal regions, which benefit from the moderating influence of the Pacific Ocean.
Locate and verify your Orange County, California, USDA zone using our three tools given below, zipcode to planting zone search tool, interactive map, or planting zone table. ( Find Orange County, California, First and Last Frost Dates)
Orange County Planting Zones Map
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Orange County Planting Zones by ZipCode
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Orange County Planting Zones Table
Below given table lists all the Orange County locations with their USDA Hardiness Zones.
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Orange County Growing Zones
The 5 planting zones in Orange County, California are Zone 8b, Zone 9a, Zone 9b, Zone 10a, and Zone 10b.
Zone 8b
Zone 8b (15°F to 20°F / -9.4°C to -6.7°C) appears in limited higher elevation areas in the easternmost parts of Orange County, particularly in the foothills and mountain regions. This zone represents the coolest climate in Orange County, covering only a small portion of the county’s total area.
Zone 8b supports trees like Southern Live Oak (Quercus virginiana) and Red Maple (Acer rubrum), along with shrubs such as Abelia (Abelia spp.) and Azalea (Rhododendron spp.).
Zone 9a
Zone 9a (20°F to 25°F / -6.7°C to -3.9°C) is found in the eastern inland portions of Orange County, typically in areas with higher elevations or in canyon locations. This zone forms a transition area between the cooler mountain areas and the more moderate coastal-influenced zones.
Suitable plants include Hibiscus (Hibiscus spp.) and Oleander (Nerium oleander).
Zone 9b
Zone 9b (25°F to 30°F / -3.9°C to -1.1°C) appears in the northeastern sections of Orange County and some inland valleys and it supports Ornamental plants like Mexican Sage (Salvia leucantha), Kangaroo Paw (Anigozanthos spp.), and California Poppy (Eschscholzia californica).
Zone 10a
Zone 10a (30°F to 35°F / -1.1°C to 1.7°C), includes cities such as Brea, Buena Park, Cypress, Emerald Bay, La Habra, La Palma, Laguna Beach, Los Alamitos, Midway City, North Tustin, Rossmoor, San Clemente, Stanton, Villa Park, Westminster, and Yorba Linda.
This zone covers significant portions of northern and coastal Orange County and supports native shrubs such as Manzanita (Arctostaphylos spp.), Toyon (Heteromeles arbutifolia), and Lemonade Berry (Rhus integrifolia).
Zone 10b
Zone 10b (35°F to 40°F / 1.7°C to 4.4°C), encompasses numerous Orange County communities including Aliso Viejo, Anaheim, Balboa Island, Capistrano Beach, Corona del Mar, Costa Mesa, Coto de Caza, Dana Point, Foothill Ranch, Fountain Valley, Fullerton, Garden Grove, Huntington Beach, Irvine, Ladera Ranch, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest, Mission Viejo, Newport Beach, Orange, Placentia, Rancho Santa Margarita, San Juan Capistrano, Santa Ana, Seal Beach, Sunset Beach, Trabuco Canyon, and Tustin.
This zone represents the mildest climate in Orange County, covering most of the central and coastal regions, which benefit from the moderating influence of the Pacific Ocean and supports citrus trees like Lemon (Citrus limon) and Orange (Citrus sinensis), along with flowering vines such as Bougainvillea (Bougainvillea spp.).