One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of estimating when it's the best time to plant flax is to check out the USDA zone info for Phoenix.

Planting Calendar for Flax

Frost tolerance for flax:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since flax are moderately cold tolerant you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant flax in Phoenix is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant flax and expect a good harvest is probably October. If you wait any later than that and your flax may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your flax indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Phoenix. You should expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Phoenix may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Phoenix last frost occurs after February 15 so make sure that you are prepared to protect your flax in the event of a surprise late frost.

USDA Zone Info for Phoenix

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Phoenix

You may be interested in your other planting guides for Phoenix.