When to Plant in Irvine, CA

Irvine, California, is renowned for its favorable climate, which essentially eliminates the occurrence of hard frost in a typical year. This frost-free environment allows gardeners to plan for continuous crop production throughout the year. With no risk of freezing temperatures, you can enjoy a diverse selection of greens, herbs, and vegetables for planting at any time. This means you can sow crops successively, ensuring a constant supply of fresh produce from your garden. Whether you prefer leafy greens like lettuce and kale or fragrant herbs like basil and parsley, you can effectively cultivate them all year round without concern for frost damage.

The microclimate of Irvine is classified as Mediterranean, characterized by mild, dry summers and moderate winters. This climate is especially conducive to growing crops such as tomatoes, peppers, and various herbs, which thrive in the warm temperatures and ample sunlight during the growing season. However, certain crops may struggle in this environment. For instance, crops that require winter chill, such as certain varieties of apples and cherries, may not perform well. Additionally, plants that are sensitive to humidity or excessive heat, like certain leafy greens, might face challenges during the hotter summer months.

What to plant now in Irvine

Now is an excellent time for planting fast-growing crops like radishes, lettuce, and spinach. These crops will establish quickly and can be harvested in just a few weeks, providing you with fresh greens.
You can also plant perennial herbs such as rosemary, thyme, and oregano. These herbs will thrive in the warm temperatures and can be used fresh or dried for cooking throughout the year.
Consider starting a second round of warmer season plants like eggplants and peppers. If you've already succeeded with an early crop, planting them again will ensure continuous harvest throughout the summer.
For those interested in extending their harvest, planting a range of vegetables such as carrots, beets, and onions can fill the garden beds, providing an abundant yield with a variety of flavors.

Irvine has a year-round, frost-free season. Cool-season crops: Lettuce, Carrots, Peas, Onion, Spinach, Kale, Broccoli, Cabbage, Radish, Beets, Potatoes, Garlic, Strawberry, Cauliflower, Swiss Chard, Arugula, Brussel Sprouts, Cilantro, Parsley, Celery, Scallions, Turnip, Kohlrabi, Bok Choy, Collards, Chives, Dill, Oregano, Rosemary, Sage, Thyme, Calendula, Lavender, Mint. Warm-season crops: Tomato, Pepper, Cucumber, Beans, Zucchini, Corn, Pumpkin, Butternut Squash, Eggplant, Okra, Basil, Cantaloupe, Cosmos, Marigolds, Melons, Nasturtiums, Pole Beans, Spaghetti Squash, Sunflowers, Tomatillos, Watermelon, Yellow Squash, Zinnias.

Month by month in Irvine

Month	What to do
January	In January, it's a great time for planting cool-season crops like lettuce, kale, and peas. The mild winter temperatures allow for steady growth, leading to an early spring harvest.
February	February offers a good environment for sowing more greens and early root vegetables. Focus on direct sowing carrots and radishes as the days lengthen and temperatures start to rise slightly.
March	As temperatures warm up in March, consider planting herbs and starting your warm-season vegetables indoors. Begin sowing tomatoes and peppers to get a jump on the growing season.
April	April is optimal for setting out seedlings of tomatoes, peppers, and basil. The soil temperature is warm enough now for these heat-loving plants to thrive, leading to a robust summer harvest.
May	In May, the warmer days make it fantastic for planting warm-season crops directly into the garden. Beans, corn, and eggplants should be sown for a summer bounty, taking advantage of the consistent warmth.
June	June is peak growing season in Irvine, perfect for maintaining your crops. Keep watering regularly, especially for thirsty plants like tomatoes, and start succession planting for a continuous harvest.
July	During July, monitor your crops for pests and diseases, as warm temperatures promote rapid growth of both plants and pests. Planting a second round of beans or squash can keep your garden productive.
August	August brings heat, making it essential to stay vigilant with watering and mulching. This is a great time to harvest summer crops while planning for fall plantings of greens and root vegetables.
September	In September, as temperatures begin to cool slightly, it's ideal for planting fall crops. Sow seeds for cool-season crops like broccoli, carrots, and leafy greens for a late-season harvest.
October	October is perfect for planting garlic and onions. Additionally, continue to sow fast-growing greens that can thrive in cooler weather, preparing for a harvest before winter sets in.
November	In November, the mild temperatures allow for planting more leafy greens and cover crops to enrich your soil. It's a good time to tidy up the garden and prepare for the coming winter.
December	December is the time to enjoy your winter garden! Continue to harvest mild weather crops, and consider starting indoor seedlings for the upcoming spring, ensuring a head start on your gardening for next year.

Frost dates for Irvine ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
92618	January 8	January 3	10b

FAQ

When is the last frost in Irvine?

In Irvine, 32°F frost is essentially absent from the long-term NOAA record, indicating that gardeners do not need to worry about frost damage affecting their crops throughout the year. This unique climate allows for continuous planting and harvesting.

What vegetables grow best in Irvine?

The best vegetables for Irvine include tomatoes, peppers, eggplants, and a variety of leafy greens. Their growth thrives in the warm conditions and long growing season.

When should I plant tomatoes in Irvine?

You can plant tomatoes as early as March in Irvine. Start seeds indoors or choose transplants for a warmer early summer harvest with no frost concerns.

Can I garden year-round in Irvine?

Absolutely! Irvine's mild climate allows for year-round gardening with a wide variety of crops. You can plant everything from cool-season greens in the winter to a variety of summer vegetables with confidence.

How does Plan My Garden help Irvine gardeners?

Plan My Garden provides tailored gardening advice, tools, and resources specifically for Irvine's unique climate. Our site helps you plan your garden effectively, ensuring optimal planting times and crop selections for success.