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

The USDA zone info for Wheat Ridge can be used to determine when it's a good idea to plant dahlia.

Planting Calendar for Dahlia

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

Dahlia are not cold tolerant which tells us that you really should wait until it warms up after the last frost before you can plant them.

The earliest that you can plant dahlia in Wheat Ridge 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 dahlia and expect a good harvest is probably August. If you wait any later than that and your dahlia may not have a chance to really do well. Starting your dahlia indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Wheat Ridge. In the coldest months of winter you can expect an average low temperature of -10°F.

Always keep in mind that USDA zone info for Wheat Ridge may not be accurate from year to year and the actual date of last frost is different every year. Half of the time in Wheat Ridge you get a frost after April 15 so make sure that you are prepared to cover your dahlia if you have a surprise late frost.

USDA Zone Info for Wheat Ridge

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°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 -5°F.

Plants to Grow in Wheat Ridge

You may be interested in your other planting guides for Wheat Ridge.