When to Plant in Tucson, AZ

Tucson, located in a hot desert (Sonoran) climate, experiences its last spring frost around February 16 and sees the first fall frost by November 29. The region boasts an impressive 286 frost-free days, allowing for extensive gardening opportunities throughout the year. This extended growing season opens doors for a diverse array of crops, making Tucson an excellent location for both novice and experienced gardeners looking to cultivate a bountiful harvest.

The hot desert (Sonoran) microclimate significantly influences the types of plants that thrive here. Vegetables such as tomatoes, peppers, and melons excel in the high temperatures and abundant sunlight. However, crops like lettuce and spinach often struggle due to the intense heat and lower moisture levels during peak summer months. Understanding these dynamics is key to successfully gardening in this unique environment.

What to plant now in Tucson

Spring: Start your spring planting now by sowing warm-season crops such as tomatoes and peppers. Planting can commence as soon as February 16, just after the last frost date of February 16.
Summer: As the heat intensifies, focus on heat-tolerant crops like okra and eggplant. Plant these from mid-May onwards, well before the summer's peak temperatures take hold.
Fall: Begin fall gardening by seeding crops like kale and broccoli in early September. With the first frost arriving November 29, you should have enough time for these cold-hardy plants to mature.
Winter: Late winter is a perfect time for establishing hardy greens such as spinach and Swiss chard. Start your planting in late January to ensure they thrive before the spring rush begins.

In Tucson (286 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 Tucson

Month	What to do
January	In January, consider preparing your garden beds for the upcoming spring planting. If the weather permits, start seeds indoors for tomatoes and peppers, which are sensitive to frost.
February	February is a transitional month as it nears the last frost of the season on February 16. Begin sowing warm-season crops indoors to be ready to transplant after the frost date.
March	March signals the arrival of warmer temperatures. After the frost-free date of February 16, it's time to transplant the seedlings into your garden and also direct seed heat-loving crops.
April	April is ideal for planting summer crops like cucumbers and squash. Ensure they are watered adequately, especially as the temperatures begin to rise significantly.
May	May brings soaring temperatures, making it essential to monitor your plants for heat stress. Continue sowing heat-tolerant crops like eggplants as optimal conditions prevail.
June	In June, maintain proper watering and care as peak summer heat sets in. This month is optimal for harvesting early summer crops like zucchini and peppers.
July	July offers extreme heat; careful irrigation becomes critical for surviving plants. Opt for desert-adapted varieties that can take the heat without wilting.
August	August continues the heat but is also a good time to plan your fall crops. Begin prepping your garden beds for new seeds as the first fall frost approaches.
September	September is the perfect window for sowing fall crops like kale and broccoli. Plant these now to ensure a fruitful harvest before the November 29 frost.
October	In October, check the growth of your fall crops. The weather cools, and it's crucial to provide protection should temperatures drop dramatically as frost approaches.
November	November is marked by the imminent frost on November 29. Harvest your remaining crops by this date, and start planning for winter gardening if desired.
December	December signals the onset of winter. Consider planting cool-season crops and preparing your garden for the next growing season, ensuring frost protection.

Frost dates for Tucson ZIP codes

ZIP	Last spring frost (50%)	First fall frost (50%)	Zone
85710	February 16	November 29	9b

FAQ

When is the last frost in Tucson?

The last frost in Tucson typically occurs on February 16, marking the end of the danger for frost-sensitive plants.

What vegetables grow best in Tucson?

Tomatoes, peppers, and melons thrive exceptionally well in Tucson's Sonoran desert climate due to the long, hot growing seasons.

When should I plant tomatoes in Tucson?

Tomatoes should be planted outdoors shortly after February 16, once the last frost has passed, for the best yield.

Can I garden year-round in Tucson?

Yes, Tucson's hot desert climate allows for year-round gardening with careful planning to accommodate the extreme temperatures.

How does Plan My Garden help Tucson gardeners?

Plan My Garden provides tailored advice and resources specific to the Tucson climate, helping gardeners make informed planting decisions.