The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

One way of getting a good idea when it's the best time to plant tall phlox is to use the USDA zone info for Ironton.

Planting Calendar for Tall Phlox

Frost tolerance for tall phlox:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Tall Phlox are moderately cold tolerant which means that you can get them planted earlier than other frost tender plants.

The earliest that you can plant tall phlox in Ironton is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant tall phlox and expect a good harvest is probably September. You probably don't want to wait any later than that or else your tall phlox may not have a chance to grow to maturity. If you are starting your tall phlox indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Ironton the average date of last frost happens on April 15. In the coldest months of winter you can expect an average low temperature of -5°F.

Remember that USDA zone info for Ironton is not always accurate and the actual date of last frost is different every year. Since half of the time in Ironton last frost occurs after April 15 be ready to protect your tall phlox in the event of a surprise late frost.

USDA Zone Info for Ironton

Here is the info for USDA Zone 6b.

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

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

Plants to Grow in Ironton

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