Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Phoenix, AZ, based on the USDA Hardiness Zone 9b.
On this page:
Phoenix, AZ Frost Dates & Growing Season
First and last frost dates show gardeners the average beginning and end of freezing temperatures in their area, helping them know when to start planting and when to protect plants from cold. The following are average dates for Phoenix:
Last Spring Frost
January 6th
For sensitive plants, wait until after January 20th.
First Fall Frost
December 11th
Plan to harvest or protect tender plants before this average first frost date of the season.
Growing Season
~309 Days
The average number of frost-free days to grow your favorite annuals like tomatoes and peppers.
Remember, these are averages, not guarantees so only use these dates as a starting point! Always check your local weekly forecast before planting, and be ready to cover plants if an unseasonal frost is predicted or delay sowing/transplanting if the soil is still too cold or the forecast looks unfavorable.
Average Monthly Temperatures in Phoenix
The chart below shows the average temperature recorded in the past 3 years. The blue shaded area indicates the potential for frost (temperatures at or below 32°F / 0°C), a key factor in determining your planting schedule.
Phoenix, AZ Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Phoenix, AZ Monthly Planting Recommendations
January
In January, recommended activities include direct sowing Black Bean (from January 20th to February 3rd), direct sowing Runner Bean (from January 13th to January 27th), and direct sowing Zucchini (from January 13th to January 27th).
July
In July, recommended activities include starting Cauliflower seeds indoors (from July 24th to August 7th) and starting Broccoli seeds indoors (from July 24th to August 7th).
August
In August, recommended activities include starting Cabbage seeds indoors (from August 7th to August 21st).
September
In September, recommended activities include direct sowing Beet (from September 18th to October 2nd), direct sowing Saffron (from September 4th to October 2nd), and direct sowing Kale (from September 4th to October 2nd).
October
In October, recommended activities include starting Samphire seeds indoors (from October 28th to November 11th), direct sowing Lily (from October 16th to November 13th), and direct sowing Poppy (from October 16th to November 13th).
November
In November, recommended activities include starting Butternut Squash seeds indoors (from November 25th to December 9th), starting Calabash seeds indoors (from November 11th to November 25th), and direct sowing Radish (from November 25th to December 9th).
December
In December, recommended activities include direct sowing Carrot (from December 9th to December 23rd), direct sowing Skirret (from December 9th to December 23rd), and direct sowing Calendula (from December 30th to January 13th).