When to Plant in San Bernardino, CA

San Bernardino enjoys a gardening-friendly climate characterized by a median last spring frost on January 21 and a median first fall frost on December 24, offering an impressive total of 323 frost-free days. This lengthy growing season allows gardeners to cultivate a wide variety of vegetables, fruits, and flowers throughout the year. The favorable conditions set the stage for an abundant harvest, making it possible to plan multiple planting cycles and enjoy fresh produce straight from the garden.

The microclimate in San Bernardino is classified as Mediterranean (mild, dry summers), which significantly influences what can thrive in this region. Crops like tomatoes, peppers, and eggplants flourish in this environment due to their preference for warm temperatures and minimal rainfall. On the contrary, crops such as lettuce and spinach may struggle in the intense summer heat and dry conditions, often requiring more moisture and cooler temperatures to grow successfully.

What to plant now in San Bernardino

Spring: Start planting warm-season crops like tomatoes and peppers indoors by mid-February, then transplant them outdoors after January 21, ensuring a healthy early harvest.
Summer: Continue planting warm crops like basil and zucchini as the season progresses. They thrive in the long growing season, ideally sown after the last frost.
Fall: Begin planting cool-season crops such as broccoli and kale in early September; they'll establish well before the first frost on December 24.
Winter: Consider starting a winter garden with hardy greens and onions. Prepare your beds in late November and early December to ensure growth before the first fall frost.

In San Bernardino (337 frost-free days, a very long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.

Month by month in San Bernardino

Month	What to do
January	In January, prepare for the approach of the last frost, which occurs on January 21. Use this month to plan your spring garden, starting seeds indoors for tomatoes and peppers.
February	As temperatures begin to rise, finish starting seeds indoors for your warm-season crops. Transplant seedlings outdoors after January 21, ensuring they acclimatize properly.
March	March is ideal for direct sowing warm-season crops like beans and squash. The risk of frost has passed, and the garden is ready for vibrant growth.
April	In April, continue planting warm-weather crops. It's time to focus on watering and mulching around the newly planted vegetables to retain soil moisture as the heat rises.
May	May is peak planting time for summer crops. Sow sunflowers and melons, and maintain consistent irrigation as the dry heat sets in, ensuring healthy plant development.
June	June signals the start of summer gardening. Monitor soil moisture levels closely for your hot-weather plants, and consider succession planting for a continuous harvest.
July	In July, focus on weeding and pest control as your crops mature. It's also a perfect time to add herbs like cilantro and basil to your garden for fresh flavors.
August	August is time to think about fall planting. While the heat continues, start preparing your beds for cool-season crops to plant in September.
September	September brings the opportunity to plant cool-season crops. Begin sowing broccoli and kale, taking advantage of the remaining warmth before the first frost on December 24.
October	October is a crucial month for fall gardening. Harvest summer crops while completing sowing of winter greens and cover crops to improve soil health.
November	As temperatures drop in November, focus on protecting your garden. Mulch your beds to retain soil warmth and prepare for winter gardening.
December	In December, protect your winter garden against frost. It's the time to enjoy the fruits of your labor and plan for the upcoming planting season.

Frost dates for San Bernardino ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
92407	January 21	December 24	10a

FAQ

When is the last frost in San Bernardino?

The last frost in San Bernardino typically occurs on January 21, marking the end of the cold weather and allowing for spring planting.

What vegetables grow best in San Bernardino?

Vegetables like tomatoes, peppers, and eggplants thrive in San Bernardino's Mediterranean climate due to their preference for warm, dry conditions.

When should I plant tomatoes in San Bernardino?

Tomatoes should be started indoors in February and transplanted outdoors after the last frost date of January 21 for optimal growth.

Can I garden year-round in San Bernardino?

Yes, San Bernardino's climate allows for year-round gardening, particularly with a focus on warm-season crops in the spring and summer, and cool-season crops in the fall.

How does Plan My Garden help San Bernardino gardeners?

Plan My Garden provides tailored planting calendars, advice specific to local climates, and tools to optimize your gardening experience based on San Bernardino's unique conditions.