Hawaii Planting Zones

Aloha! Known as the Aloha State, Hawaii offers a tropical paradise for gardeners with its lush landscapes and year-round warmth. 

Unlike most mainland states, Hawaii doesn't follow the traditional USDA hardiness zone system. Instead, it's classified entirely as Zone 11, with average annual minimum temperatures above 40°F (4.4°C).

Hawaii's unique geography and climate create a gardener's dream – and a fascinating challenge.

In this article, you will learn: 

 

As an archipelago of volcanic islands in the middle of the Pacific, Hawaii boasts an incredible diversity of microclimates. From sun-drenched beaches to misty mountain slopes, each area presents its gardening opportunities. 

This diversity means that urban gardeners across the islands can grow an astonishing variety of plants, from tropical fruits to delicate orchids and even some temperate vegetables, with the proper care.

Hawaii

Image from USDA

Characteristics of Hawaii’s Planting Region

Hawaii's climate is classified as tropical, characterized by:

  • Warm temperatures year-round, typically between 70-85°F (21-29°C)
  • High humidity levels, especially in coastal areas
  • Two main seasons: a dry summer (May to October) and a wetter winter (November to April)
  • Microclimates that vary based on elevation and location on each island

As a Hawaiian gardener, you'll encounter:

  • Consistent warm temperatures allow for year-round growing
  • Abundant rainfall in many areas, particularly on the windward sides of islands
  • Strong trade winds, especially in exposed areas
  • Volcanic soils are rich in some minerals but potentially lacking in others

Despite these unique conditions, Hawaii offers an incredible opportunity for urban gardeners. With proper planning, you can enjoy fresh, homegrown produce every month of the year. 

Challenges of Growing in Hawaii

Pest Pressure 

The tropical climate supports a variety of pests year-round. From fruit flies to aphids, vigilant monitoring and organic pest control methods are often necessary.

Soil Variability 

Hawaiian soils can vary dramatically, from rich volcanic soils to sandy coastal areas. Many urban areas may have compacted or nutrient-depleted soils, requiring amendments for optimal growth.

Salt Exposure 

Coastal gardens may face challenges from salt spray, damaging some plants and affecting soil quality.

The Benefits of Using a Greenhouse in Hawaii 

While Hawaii's climate allows for year-round outdoor growing, a greenhouse can still benefit urban gardeners significantly.

1. Protect from Excessive Rainfall 

  • Without a Greenhouse: Heavy rains during the wet season can damage delicate plants and flowers and promote fungal growth. 
  • With a Greenhouse: You can control water levels precisely, protecting sensitive plants from oversaturation and reducing the risk of fungal diseases.

Learn more about your area's specific growing dates and the best vegetables to plant in each part of Hawaii.

Customer images of their Greenhouse setup in Hawaii

2. Grow a Wider Variety of Vegetables Without a Greenhouse: 

  • Without a Greenhouse:  

While Hawaii's climate supports many tropical plants, some vegetables and herbs from cooler climates may struggle. 

  • Tomatoes
  • Peppers
  • Sweet corn
  • Watermelons
  • Peanuts
  • Peaches
  • Cucumbers
  • Squash
  • Cantaloupes
  • Lima beans
  • With a Greenhouse: 

Expanding your growing options, you can create microclimates for plants that prefer slightly cooler or drier conditions. Try cultivating:

  • Arugula,
  • Spinach, 
  • Broccoli,
  • Cauliflower, 
  • Brussels sprouts, 
  • Tomatoes, 
  • Peppers,
  • Eggplant, Cucumbers, environment)
  • melons, 
  • Zucchini, 
  • Carrots, 
  • Beets, 
  • Radishes)
  • Kale, 
  • Swiss chard,
  • Collard greens)
  • Basil, 
  • Cilantro
  • Parsley,
  • Rosemary,
  • Thyme, 
  • Green beans, Green onions,
  • Leeks)
  • Lemons,
  • Limes,
  • Kumquats,
  • Figs

Why Planta Greenhouses?

For Hawaii, we recommend the following greenhouses:

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