USDA Hardiness Zone 10 Planting Guide
Zone 10 covers locations where the average annual extreme minimum winter temperature ranges from 30 to 40 degrees Fahrenheit. This page covers both subzones: zone 10a (30 to 35 degrees F) and zone 10b (35 to 40 degrees F).
Zone 10 Overview
Zone 10 covers the warmest parts of the continental United States: South Florida, the southernmost tips of Texas and Louisiana, and coastal Southern California. Minimum winter temperatures of 30 to 40 degrees Fahrenheit mean frost is rare to nonexistent. Growing conditions approach tropical year-round, and the distinction between seasons blurs into wet and dry periods rather than warm and cold. Zone 10 gardeners face unique challenges: intense heat, tropical pest and disease pressure, alkaline or sandy soils, and the need for plants that tolerate both high temperatures and occasional cool spells. The rewards include growing fruits and flowers that are impossible outdoors in the rest of the continental United States.
Zone 10 Temperature Ranges
| Subzone | Min Temp (°F) | Max Temp (°F) | Description |
|---|---|---|---|
| 10a | 30°F | 35°F | South Florida and Southern California; tropical plants |
| 10b | 35°F | 40°F | Miami and coastal SoCal; frost-free most years |
Plants for Zone 10
Zone 10 is tropical and subtropical plant paradise. Mangos, avocados, lychees, papayas, bananas, coconut palms, and jackfruit all bear fruit outdoors. Ornamental tropicals including orchids, heliconias, bromeliads, plumeria, and frangipani create lush landscapes. Palms of every description flourish. Bougainvillea, hibiscus, and ixora provide year-round color. Many traditional temperate plants struggle here due to insufficient winter cold: peonies, tulips, lilacs, and high-chill fruit trees like Gala apples will not perform without extraordinary measures.
Vegetable Gardening in Zone 10
Zone 10 vegetable gardening follows a subtropical calendar. The cool season from October through April is the primary growing window for most vegetables: tomatoes, peppers, squash, cucumbers, beans, and corn all perform best during these cooler months. Leafy greens and root crops grow through the mild winter. Summer (May through September) is challenging for all but the most heat-tolerant crops: sweet potatoes, okra, yard-long beans, Malabar spinach, and heat-set tomato varieties. Tropical vegetables like cassava, taro, malanga, and boniato are year-round crops unique to zone 10 gardens.
Frost Protection & Season Tips for Zone 10
Zone 10 gardening revolves around heat and water management rather than frost protection. On the rare occasions when temperatures approach freezing, covering tropical plants with frost cloth for one or two nights is typically sufficient. The primary challenges are managing irrigation during dry seasons, providing afternoon shade for vegetables during peak summer, selecting pest-resistant varieties for the year-round growing environment, and managing soil conditions (highly alkaline coral rock in South Florida, sandy soils in many coastal areas). Hurricane preparation and wind-resistant plant selection are also important considerations.
Cities in Zone 10
The following cities in our database fall within zone 10. Click any city for detailed frost dates and planting calendars.
| City | State | Subzone | Growing Season | Last Spring Frost | First Fall Frost |
|---|---|---|---|---|---|
| Los Angeles | California | 10a | 356 days | January 3 | December 25 |
| San Francisco | California | 10a | 339 days | January 10 | December 15 |
| San Diego | California | 10b | 365 days | January 1 | December 31 |
| Miami | Florida | 10b | 365 days | January 1 | December 31 |