One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's a good idea to figure out when you can plant scaevola by looking at the USDA zone info for Tucson.

Planting Calendar for Scaevola

Frost tolerance for scaevola:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since scaevola require warm weather it's important to wait until after the last frost before you can plant them.

The earliest that you can plant scaevola in Tucson is March. However, you really should wait until April if you don't want to take any chances.

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

Last Frost Date

The average date of last frost is February 15 in Tucson. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Tucson is an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Tucson there is a last frost after February 15 be ready to cover your scaevola in the event of a surprise late frost.

USDA Zone Info for Tucson

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 Tucson

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