Before planting it is a good idea to find your USDA Zone info to determine 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 Napa you can determine when it's the best time to plant gloriosa lily by referring to the USDA zone info.

Planting Calendar for Gloriosa Lily

Frost tolerance for gloriosa lily:	Not tolerant of frost.
When to plant:	After the last frost has passed.

You can not plant gloriosa lily until after the last frost because they require warm weather.

The earliest that you can plant gloriosa lily in Napa is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant gloriosa lily and expect a good harvest is probably September. Any later than that and your gloriosa lily may not have a chance to really do well. If you are starting your gloriosa lily indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Napa the average date of last frost happens on February 15. In the coldest months of winter you can expect an average low temperature of 25°F.

Since the USDA zone info for Napa is just an average the actual date of last frost will vary from year to year. Half of the time in Napa last frost occurs after February 15 so just be sure to be ready to cover your gloriosa lily in the event of a surprise late frost.

USDA Zone Info for Napa

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Napa

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