One of the best tools that you have as gardeners to help us estimate 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.

In Warrenton you can estimate when it's the best time to plant fennel by using the USDA zone info.

Planting Calendar for Fennel

Frost tolerance for fennel:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Fennel do ok in pretty solid cold which tells us that you can plant them much earlier in the year than more sensitive plants.

The earliest that you can plant fennel in Warrenton 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 fennel and expect a good harvest is probably September. Any later than that and your fennel may not have a chance to fully mature. Starting your fennel indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Warrenton. It might get as low as 0°F during the coldest months of winter.

Remember that USDA zone info for Warrenton may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Warrenton you get surprised by a frost after April 15 so make sure that you are prepared to protect your fennel if you have a late frost.

USDA Zone Info for Warrenton

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 Warrenton

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