The USDA Zone info is a great tool for gardeners to help us figure out 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.

A way of figuring out when it's the best time to plant hamburg root parsley is to consult the USDA zone info for Renton.

Planting Calendar for Hamburg root parsley

Frost tolerance for hamburg root parsley:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Hamburg root parsley do well in some cold which means that you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant hamburg root parsley in Renton 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 hamburg root parsley and expect a good harvest is probably September. If you wait any later than that and your hamburg root parsley may not have a chance to fully mature. Starting your hamburg root parsley indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on March 15 in Renton. It might get as low as 15°F during the coldest months of winter.

Since the USDA zone info for Renton is an average the actual date of last frost will vary from year to year. Since half of the time in Renton there is a last frost after March 15 be ready to cover your hamburg root parsley if you have a surprise late frost.

USDA Zone Info for Renton

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in Renton

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