Big Island Planting Calendar: Your Monthly East Hawaii Guide

The Big Island planting calendar by month is shaped by East Hawaiʻi’s unique tropical climate. While you can grow year round, the best time for leafy greens is the cooler months (November–March), while heat loving crops like melons and peppers thrive in the summer (May–September).

How do microclimates affect the Big Island planting calendar by month?

Microclimates on the Big Island determine your planting success because rainfall and temperature vary drastically across short distances. While the Kona side experiences a summer rainy season and dry winters, Puna and Hilo deal with high year round humidity and heavy trade wind showers that require different drainage strategies.

Living on the Big Island means you might be gardening in a rainforest or a dry cinder field. In the Hilo and Puna districts, the consistent moisture allows for lush growth, but it also increases the risk of fungal diseases.

Backyard growers must observe their specific elevation. Higher elevations like Volcano or Mountain View are significantly cooler than coastal Keaʻau, meaning your tomatoes might take longer to ripen up the hill.

What is the difference between Puna and Kona growing seasons?

The primary difference between Puna and Kona growing seasons is the timing of the rainfall. Kona’s wet season occurs during the warm summer months, whereas Puna receives the majority of its heavy rainfall during the winter trade wind season, requiring Puna gardeners to focus on wet-weather crops in the winter.

Month-by-Month Planting Guide for Big Island Backyard Farmers

Timing your seeds is essential for a high-yield garden. Here is a general guide for our East Hawaiʻi neighbors:

• January–February:

  Best for cool-season crops. Plant lettuce, radishes, carrots, and beets. It is also a great time to start your pepper seeds indoors.

• March–April:

  Transition period. Plant beans, corn, and squash. Start applying specialized fertilizers to prepare for the spring growth spurt.

• May–June:

  Peak heat begins. Focus on eggplant, okra, sweet potatoes, and tropical pumpkins. These crops handle the rising humidity and sun intensity well.

• July–August:

  High summer. Excellent for melons and sun-loving herbs like basil. Be sure to monitor irrigation if the trade winds die down.

• September–October:

  Second shoulder season. Plant another round of beans and prepare your beds for the cooler winter months by adding soil amendments.

• November–December:

  Return to greens. Plant kale, Swiss chard, and cabbage. This is also the ideal time for orchard maintenance and planting new fruit trees.

How should you adjust your fertilizing schedule for the wet vs. dry season?

You should adjust your fertilizing schedule by applying smaller, more frequent doses during the wet season to prevent nutrient leaching. In the dry season, use slow-release granules or organic compost that helps retain moisture while providing a steady supply of nutrients to your thirsty plants.

Heavy rains in Hilo and Puna can quickly wash away water-soluble fertilizers. Using organic matter helps create a buffer, ensuring your plants do not starve after a heavy downpour.

Check in with our team at Miranda Country Store to find the right blend for your specific crop needs, whether you are growing citrus or a commercial vegetable patch.

What are the best crops for the Puna District?

The best crops for the Puna District are those that tolerate high humidity and frequent rainfall, such as taro (kalo), edible ginger, turmeric, bananas, and papayas. For vegetables, choose "heat-set" tomato varieties and leafy greens that are resistant to powdery mildew and downy mildew.

Because Puna gets so much rain, drainage is your best friend. Many local growers use raised beds or mounds to keep "wet feet" from rotting their root systems. Crops like pigeon peas and sweet potatoes are incredibly hardy in our volcanic soil.

If you are looking to secure your garden from roaming pigs or neighbors, consider our fencing products to keep your hard work protected.

Which soil amendments are essential for volcanic soil?

The most essential soil amendments for volcanic soil include agricultural lime to balance acidity, phosphorus to encourage root development, and organic compost to add biology to cinder. Volcanic soils are often "new" and lack the broken-down organic matter needed to hold onto essential plant nutrients.

In Keaʻau, we often deal with ʻaʻā lava or cinder. This material drains fast but does not hold nutrients well. Adding biochar or well-rotted manure can significantly improve your garden's water-holding capacity.

Don't forget to supplement with calcium and magnesium. These minerals are often deficient in high-rainfall areas but are critical for preventing blossom end rot in your tomatoes and peppers.

Where can you find quality seeds and starts in Keaʻau?

You can find quality seeds, starts, and supplies at Miranda Country Store in Keaʻau. We provide products specifically selected for the Big Island’s environment, including climate-appropriate seeds and animal feed for those integrated farms that use livestock for natural fertilization and weed control.

Supporting local means getting advice that actually works for our specific weather. Stop by and talk to us about what is currently popping in the local gardens and what you should be starting in your nursery flats this week.

Ready to get your garden growing? Whether you need the right tools, the best seeds, or expert advice on the current planting season, we are here to help you succeed.

Frequently Asked Questions

When is the best time to plant tomatoes on the Big Island?

The best time to plant tomatoes in East Hawaiʻi is during the slightly drier and cooler months from February through May. This timing helps avoid the peak humidity of late summer, which can lead to increased blight, while ensuring the plants get enough sun to ripen the fruit.

How do I stop my plants from drowning in the Puna rain?

To prevent plants from drowning in Puna, use raised garden beds or planting mounds that allow water to drain away from the root zone. Incorporating perlite or coarse cinder into your soil mix also improves aeration, preventing roots from rotting during periods of heavy, localized trade wind rainfall.

What are the easiest vegetables to grow in Hilo?

Easiest vegetables for the Hilo area include sweet potatoes, eggplant, beans, and leafy greens like choy sum or kale. These plants handle the high moisture levels well. Perennial crops like "tree spinach" (chaya) or edible hibiscus are also extremely successful and low-maintenance in East Hawaiʻi gardens.