Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first chance to plant dahlia in Ridgefield should be estimated by reviewing the USDA zone info.

Planting Calendar for Dahlia

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

You can not plant dahlia until after the last frost because they do not do well in cold weather.

The earliest that you can plant dahlia in Ridgefield 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. You can get started a little bit earlier by starting your dahlia indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Ridgefield. In the coldest months of winter you should expect an average low temperature of 0°F.

Since the USDA zone info for Ridgefield is not always accurate the actual date of last frost will vary from year to year. Half of the time in Ridgefield you get a frost after April 15 so make sure that you are prepared to protect your dahlia in the event of one of those late frosts.

USDA Zone Info for Ridgefield

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Ridgefield

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