Before planting it is a good idea to find your USDA Zone info to estimate 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.

In Denver you can estimate when it's possible to plant lavender by looking at the USDA zone info.

Planting Calendar for Lavender

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

Lavender do ok in mild cold which means that you can plant them a little earlier in the year than more sensitive plants.

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

Last Frost Date

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

It's important to remember that USDA zone info for Denver is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Denver you get a frost after April 15 so make sure that you are ready to protect your lavender in the event of a late frost.

USDA Zone Info for Denver

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°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 -10°F.

Plants to Grow in Denver

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