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.

In Oshkosh you can estimate when you can plant anchusa by reviewing the USDA zone info.

Planting Calendar for Anchusa

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

Anchusa are very cold tolerant which tells us that you can start planting them much earlier than other frost tender plants.

The earliest that you can plant anchusa in Oshkosh 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 anchusa and expect a good harvest is probably September. If you wait any later than that and your anchusa may not have a chance to grow to maturity. Starting your anchusa indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on April 15 in Oshkosh. In the coldest months of winter you should expect an average low temperature of -20°F.

Since the USDA zone info for Oshkosh is just an average the actual date of last frost will vary from year to year. Half of the time in Oshkosh you get a frost after April 15 so be sure to be ready to cover your anchusa if you have one of those late frosts.

USDA Zone Info for Oshkosh

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

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

Plants to Grow in Oshkosh

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