When To Plant In Phoenix

The best time to plant in Phoenix is during the mild seasons of fall and spring, specifically from September through November and again from February through April.
 
That’s the sweet spot for when to plant in Phoenix because our extreme summer heat makes traditional summer planting nearly impossible for most crops.
 
If you’re new to desert gardening, figuring out when to plant in Phoenix might feel like cracking a secret code, but it’s really just about working with our unique climate instead of against it.
 
In this post, we’ll break down exactly when to plant in Phoenix for vegetables, flowers, and herbs, plus the best strategies for each season.
 
Let’s dig in.
 

When To Plant In Phoenix: The Two Main Growing Seasons

The reason when to plant in Phoenix differs so much from other regions is that we essentially get two growing seasons instead of one.
 
Our mild winters mean you can grow cool-season crops all winter long, while our hot summers force you to take a break or stick to heat-loving varieties during the monsoon months.
 
So when to plant in Phoenix really comes down to understanding these two windows and what thrives in each one.
 

1. Fall Planting Window (September – November)

Fall is hands down the most important time to answer when to plant in Phoenix.
 
As the brutal summer heat finally starts to fade, soil temperatures remain warm enough to encourage quick germination.
 
You can start planting in September for leafy greens like lettuce, spinach, and kale.
 
October is perfect for root vegetables such as carrots, beets, and radishes.
 
And by November, you can get broccoli, cauliflower, and cabbage into the ground for a winter harvest.
 
The beauty of fall planting is that your crops will mature in cooler weather, which means less stress and often sweeter flavors.
 

2. Spring Planting Window (February – April)

Spring is your second golden answer for when to plant in Phoenix.
 
As overnight lows stop dipping below freezing, usually around mid-February, you can start putting in cool-season crops for a late spring harvest.
 
March is the time for peas, Swiss chard, and more leafy greens.
 
Then, as the soil warms up in April, you can transition to warm-season crops like tomatoes, peppers, and squash.
 
Just be aware that once May rolls around, the heat comes on fast, so you want everything well-established before that happens.
 
This is why early spring is such a critical answer when you’re asking when to plant in Phoenix.
 

When To Plant In Phoenix For Warm-Season Crops

Warm-season crops are the ones that love the heat, but they still can’t survive Phoenix’s peak summer.
 
So exactly when to plant in Phoenix for these heat lovers?
 

1. Tomatoes and Peppers

Tomatoes and peppers should go in the ground from late February through March.
 
This gives them enough time to establish roots and start fruiting before the triple-digit temperatures arrive.
 
If you plant them too late, say in May, the heat will cause blossom drop and you’ll get very little fruit.
 
So for tomatoes and peppers, the answer for when to plant in Phoenix is firmly in early spring.
 

2. Squash, Cucumbers, and Melons

These fast-growing vines can actually be planted a bit later, usually in March or April.
 
They love warm soil and will take off quickly once temperatures stay above 70°F at night.
 
You can even try a second planting in late July or August for a fall harvest, but that’s a more advanced trick.
 
For the main season, though, spring is your best bet for when to plant in Phoenix with these crops.
 

3. Corn and Beans

Corn and beans do best when planted in March or early April.
 
They need consistent warmth but not extreme heat.
 
Planting them in Phoenix during these months ensures they get enough sun and warmth to germinate and grow strong.
 
Once the real heat hits, they’ll already be mature enough to handle it.
 
So if you keep asking when to plant in Phoenix for these, early spring is your answer.
 

When To Plant In Phoenix For Cool-Season Crops

Cool-season crops are where Phoenix truly shines in the garden.
 
Because our winters are so mild, you can grow these all through the cold months.
 
Here’s when to plant in Phoenix for the most popular cool-season vegetables.
 

1. Leafy Greens

Lettuce, spinach, arugula, and Swiss chard can be planted from September all the way through February.
 
They’ll grow slowly in the winter but will reward you with tender, sweet leaves.
 
For a continuous harvest, plant small batches every two weeks.
 
That way, you’ll always have fresh greens without a giant glut all at once.
 
So when to plant in Phoenix for leafy greens is honestly almost year-round.
 

2. Root Vegetables

Carrots, beets, radishes, and turnips are perfect for fall planting, from October through December.
 
They need consistent moisture and cool soil to develop properly.
 
Planting them in Phoenix during fall means they’ll be ready to pull by mid-winter.
 
You can also do a second planting in February for a spring harvest.
 
That gives you two solid windows for when to plant in Phoenix for root veggies.
 

3. Brassicas (Broccoli, Cauliflower, Cabbage)

These hearty vegetables love the cool season and can tolerate light frost.
 
Plant them from September through November for a winter harvest.
 
Or plant them in January and February for a spring harvest.
 
Either way, when to plant in Phoenix for brassicas is during our mild months.
 
They actually taste better when they mature in cooler weather, so don’t rush them.
 

When To Plant In Phoenix: Herbs And Flowers

It’s not just vegetables that need a schedule.
 
Herbs and flowers also have specific times for when to plant in Phoenix.
 

1. Perennial Herbs

Rosemary, thyme, oregano, and sage are tough and can be planted almost any time of year in Phoenix.
 
But fall and spring are still the best times to get them established.
 
Planting them when to plant in Phoenix aligns with our mild seasons reduces transplant shock.
 
They’ll have time to grow strong roots before extreme temperatures.
 

2. Annual Herbs (Basil, Cilantro, Dill)

Basil hates frost, so plant it in March or April after the last freeze.
 
Cilantro and dill prefer cool weather, so plant them in the fall (September – November) or early spring (February – March).
 
These herbs bolt quickly in heat, so getting the timing right matters.
 
When to plant in Phoenix for annual herbs really depends on whether they prefer heat or cold.
 

3. Flowers

For spring flowers like marigolds, petunias, and zinnias, plant them in March.
 
For fall flowers like pansies, snapdragons, and calendula, plant them in October.
 
These give you color throughout our mild seasons.
 
So when to plant in Phoenix for flowers follows the same rule as vegetables: avoid summer.
 

So, When To Plant In Phoenix?

The best time to plant in Phoenix is during the fall (September – November) and spring (February – April) months.
 
Fall is ideal for cool-season vegetables and winter flowers.
 
Spring is perfect for warm-season crops and summer herbs.
 
Avoid planting anything in June, July, and August unless you’re growing desert-adapted plants or trying a monsoon garden.
 
So there you have it, the complete breakdown of when to plant in Phoenix.
 
With this schedule in hand, you’ll be set up for a thriving desert garden all year long.
 
Get your seeds ready and enjoy the bounty that comes from planting at just the right time.