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.

You should be able to figure out when it's the best time to plant dipladenia by using the USDA zone info for The Dalles.

Planting Calendar for Dipladenia

Frost tolerance for dipladenia:	Not tolerant of frost.
When to plant:	After the last frost.

You should not plant dipladenia until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant dipladenia 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 dipladenia and expect a good harvest is probably August. Any later than that and your dipladenia may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your dipladenia indoors.

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.

Always keep in mind that USDA zone info for The Dalles is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in The Dalles you get surprised by a frost after March 15 so make sure that you are prepared to cover your dipladenia in the event of 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.