Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In The Dalles you can determine when it's the best time to plant alternaria by referring to the USDA zone info.

Planting Calendar for Alternaria

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

Since alternaria do not do well in cold weather you have to wait until after the last frost has passed before you can plant them.

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

The last month that you can plant alternaria and expect a good harvest is probably August. Any later than that and your alternaria may not have a chance to fully mature. Starting your alternaria indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is March 15 in The Dalles. It might get as low as 10°F during the coldest months of winter.

Since the USDA zone info for The Dalles is an average the actual date of last frost can change quite a bit from year to year. Half of the time in The Dalles it frosts late in the year after March 15 so be sure to be ready to cover your alternaria if you have a surprise late frost.

USDA Zone Info for The Dalles

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in The Dalles

You may be interested in your other planting guides for The Dalles.