When To Plant Herbs In Arizona

The best time to plant herbs in Arizona depends on your specific region, but the general rule is to plant during the cooler months of fall, winter, and early spring to avoid the brutal summer heat.
 
If you’re wondering when to plant herbs in Arizona, the answer isn’t a one-size-fits-all date, because our state has everything from low deserts to high elevations.
 
For most gardeners in Phoenix and Tucson, you’ll want to focus on the months from October through March for the majority of your herb planting.
 
In this post, we’ll break down the best times to plant herbs in Arizona, which herbs thrive in each season, and how to adjust your planting schedule for your specific zone.
 
Let’s dig into the dirt and get your herb garden growing.
 

When To Plant Herbs In Arizona: The Seasonal Breakdown

Knowing when to plant herbs in Arizona starts with understanding our two main growing seasons: the cool season and the warm season.
 
The cool season, which runs from approximately October through April, is when you’ll plant most of your favorite culinary herbs.
 
The warm season, from March through July, is reserved for heat-loving herbs that can handle the intense sun.
 
So, when to plant herbs in Arizona really comes down to choosing the right month for each type of herb.
 

1. Cool-Season Herbs (October Through March)

These are the herbs that prefer mild temperatures and will bolt or turn bitter when the heat arrives.
 
If you’re wondering when to plant herbs in Arizona like cilantro, parsley, dill, and fennel, aim for October through January.
 
These herbs love the cooler weather and will give you a steady harvest all winter long.
 
You can also plant mint, chives, and oregano in February or March, as they’re quite hardy and tolerate a bit of temperature fluctuation.
 
For best results, get these in the ground early so they establish strong roots before the last frost passes.
 

2. Warm-Season Herbs (March Through July)

Now, for the heat lovers, the question of when to plant herbs in Arizona changes dramatically.
 
Herbs like basil, rosemary, thyme, and sage actually thrive in the warmer months, but they need to be planted before the extreme heat of June and July.
 
The ideal window for planting these is from March through May, giving them time to acclimate.
 
If you plant them too late, the scorching sun can stress young seedlings, so early spring is your best bet.
 
Oregano and marjoram also fall into this category, so mark your calendar for late March.
 

3. The Monsoon Season (July Through September)

You might be surprised, but planting herbs in Arizona can also happen during the monsoon season.
 
The increased humidity and occasional rain can actually help certain herbs like lemongrass and culantro take off.
 
However, this is a tricky time to plant new herbs, and it’s usually better to focus on keeping your existing plants alive.
 
If you do plant during this window, choose fast-growing herbs and provide some afternoon shade.
 

How To Determine The Best Time To Plant Herbs In Arizona By Region

Arizona isn’t a single climate, so when to plant herbs in Arizona depends heavily on whether you’re in the low desert or the high country.
 
Let’s break it down by region so you can nail your timing.
 

1. Low Desert (Phoenix, Tucson, Yuma)

In the low desert, your growing season is extended because winters are mild and frost is rare.
 
Here, you can start planting herbs in Arizona as early as September or October for cool-season varieties.
 
You’ll get a longer harvest window, so don’t rush to pull plants in late spring.
 
For warm-season herbs, March is your go-to month, and you can often plant again in August for a second fall crop.
 

2. High Desert And Mountains (Flagstaff, Prescott, Payson)

If you live at higher elevations, when to plant herbs in Arizona shifts to a narrower window.
 
You’ll need to wait until after the last frost, which can be as late as mid-May, to plant most herbs.
 
Cool-season herbs like cilantro and parsley can be planted in April, but protect them from late snow.
 
Warm-season herbs like basil shouldn’t go in until late May or early June when nighttime temperatures stay above 50°F.
 

3. Mid-Altitude Zones (Sedona, Oracle, Wickenburg)

Mid-altitude areas get the best of both worlds, but you still need to watch for sporadic frosts.
 
Plan on planting cool-season herbs in October and November, and warm-season herbs in April.
 
This middle ground means you can often enjoy herbs year-round with a little protection during the coldest nights.
 
Pay attention to your local frost dates, as they vary by even a few miles.
 

Tips For Planting Herbs In Arizona Successfully

Now that you know when to plant herbs in Arizona, let’s talk about how to make sure they actually survive and thrive.
 
The desert sun is unforgiving, so a little preparation goes a long way.
 

1. Provide Afternoon Shade

Even cool-season herbs need a break from the intense afternoon sun in Arizona.
 
Plant them where they receive morning sun and afternoon shade, or use a shade cloth during the hottest months.
 
This simple trick prevents wilting and extends your harvest, especially if you’re planting herbs in Arizona during spring.
 

2. Amend Your Soil With Compost

Arizona soil is often rocky and alkaline, which isn’t ideal for most herbs.
 
Mix in plenty of organic compost before planting herbs in Arizona to improve drainage and nutrient content.
 
Herbs like rosemary and thyme actually prefer leaner soil, but they still benefit from a bit of organic matter.
 
Test your soil’s pH and aim for a slightly acidic to neutral range around 6.5 to 7.0.
 

3. Water Deeply And Less Frequently

When you plant herbs in Arizona, watering habits are crucial for success.
 
Instead of daily shallow watering, give your herbs a deep soak two to three times per week.
 
This encourages deep root growth, which helps plants survive the heat.
 
Always water in the early morning to reduce evaporation and prevent fungal issues.
 

4. Mulch To Retain Moisture

A layer of mulch around your herbs helps keep the soil cool and retains precious moisture.
 
Use straw, wood chips, or even gravel for a desert-friendly look.
 
Mulch also suppresses weeds, which compete with your herbs for water and nutrients.
 
Reapply mulch as needed, especially before the summer heat arrives.
 

So, When To Plant Herbs In Arizona?

The best time to plant herbs in Arizona is during the cooler months of October through March for most varieties, with warm-season herbs going in from March through May.
 
But remember, your exact timing depends on your elevation and local frost dates.
 
If you’re in the low desert, you have more flexibility and can often plant herbs in Arizona year-round with some planning.
 
Start with easy herbs like basil, cilantro, and rosemary, and you’ll be amazed at how well they perform.
 
So, when to plant herbs in Arizona isn’t a mystery anymore, just match your herbs to the season and region, and you’ll have a thriving garden in no time.
 
Happy planting.