Almond Trees and USDA Hardiness Zones

Whether grown for their spectacular springtime flowers, their health-giving nuts or both, almond trees shine as home-garden additions. Unfortunately, only a few growing zones offer what almonds need: Mediterranean-warm spring and summer temperatures paired with chilly-to-cold winter ones. Our guidelines “zone in” on which zones they are — and on almond cultivars that thrive in each.

almond-tree-zone

The Hardiness Zone Map

The USDA hardiness zone map indicates how well a specific plant will tolerate winter cold in your area. The 2012 version of the Hardiness Zone map has 13 zones, each divided into two sub-zones labeled “a” and “b”. The coldest winters occur in zone 1 (parts of Alaska) and the warmest in zone 13 (parts of Hawaii).

Illustration of an almond tree branch showing winter dormancy and spring blooms with USDA hardiness zones
Understanding how winter chill and spring warm-ups affect almond tree blooms across USDA hardiness zones.

Hardiness Zone Numbering

As you move from zone 1 up the scale, the average minimum winter temperature for each zone increases 10°F (5.6°C). A 5°F (2.8°C) difference separates winter lows between sub-zones. As an example, average winter lows in zone 7a are 30°F (16.8°C) higher than those in zone 4a, and 25° (14°C) higher than those in zone 4b.

Climate Effects on Almond Growth

Almonds thrive in climates accommodating their unique growth process. They need a January-February warm-up following a cold November and December. The warm-up awakens dormant buds; by February, the flowers are ready for pollination. In zones 6 and lower, late spring frosts may damage or kill buds and blooms. The trees survive, but their production often suffers.

The Ideal Almond-Growing Zone

If an almond-growing Paradise exists, it’s California’s Central Valley and USDA zones 9 and 10. Summers are hot and sunny and winters get cold enough to meet most chilling requirements. By February, frost leaves and temps settle between 55° to 60°F (12.7° to 15.5°C). Winter rains taper off so bees pollinate undisturbed.

Botanical illustrations of All-in-One, Garden Prince, and Nonpareil almond tree cultivars with zone data
Select the right almond cultivar for your specific USDA hardiness zone to ensure a healthy harvest.

Growing Almonds in Other Zones

Can’t match the Central Valley’s climate? Not to worry – many almond cultivars also perform acceptably in USDA zones 7 or 8. They include:

  • ‘All-in-One,’ (zones 8-9; 400 chilling hours) is a semi-dwarf, self-pollinating tree that wants lots of summer heat. As a bonus, it cross-pollinates with all other cultivars.
  • ‘Garden Prince,’ (zones 7-9; 250 chilling hours), another self-pollinating semi-dwarf, stands 10 to 12 feet tall. Regular summer pruning maintains it at 8 feet.
  • ‘Nonpareil,’(Zones 7 through 9; 400 chilling hours)adapts well to different growing conditions. Grow it with a cross-pollinator, such as ‘All-in-One.’

Expert gardener’s tip: To guarantee the almond trees you plant suit your hardiness zone, get ones started at a local nursery.

Text: Morgan Shokley
Artikelbild: aniana/Shutterstock

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