One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's possible to estimate when it's a good idea to plant bunching onions by reviewing the USDA zone info for Madera.

Planting Calendar for Bunching Onions

Frost tolerance for bunching onions:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Bunching Onions do ok in mild cold which means that you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant bunching onions in Madera 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 bunching onions and expect a good harvest is probably September. Any later than that and your bunching onions may not have a chance to really do well. You can get started a little bit earlier by starting your bunching onions indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Madera. You can expect an average low temperature of 20°F in the coldest months of winter.

Remember that USDA zone info for Madera is an average and the actual date of last frost changes from year to year. Half of the time in Madera you get a frost after February 15 so just be sure to be ready to cover your bunching onions in the event of a late frost.

USDA Zone Info for Madera

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°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 25°F.

Plants to Grow in Madera

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