WindRiverGreens/plant-variety-database huggingface dataset:
USDA Hardiness Zone 1
Minimum winter temperature: -60 	toF to -50 	toF
Average last frost: June 15
Average first frost: August 10
Growing season: 55 days
USDA Hardiness Zone 2
Minimum winter temperature: -50 	toF to -40 	toF
Average last frost: June 1
Average first frost: August 25
Growing season: 85 days
USDA Hardiness Zone 3
Minimum winter temperature: -40 	toF to -30 	toF
Average last frost: May 15
Average first frost: September 15
Growing season: 120 days
USDA Hardiness Zone 4
Minimum winter temperature: -30 	toF to -20 	toF
Average last frost: May 10
Average first frost: September 25
Growing season: 135 days
USDA Hardiness Zone 5
Minimum winter temperature: -20 	toF to -10 	toF
Average last frost: April 30
Average first frost: October 5
Growing season: 155 days
USDA Hardiness Zone 6
Minimum winter temperature: -10 	toF to 0 	toF
Average last frost: April 15
Average first frost: October 15
Growing season: 180 days
USDA Hardiness Zone 7
Minimum winter temperature: 0 	toF to 10 	toF
Average last frost: April 1
Average first frost: October 30
Growing season: 210 days
USDA Hardiness Zone 8
Minimum winter temperature: 10 	toF to 20 	toF
Average last frost: March 15
Average first frost: November 15
Growing season: 240 days
USDA Hardiness Zone 9
Minimum winter temperature: 20 	toF to 30 	toF
Average last frost: February 15
Average first frost: December 1
Growing season: 290 days
USDA Hardiness Zone 10
Minimum winter temperature: 30 	toF to 40 	toF
Average last frost: January 31
Average first frost: December 15
Growing season: 320 days
USDA Hardiness Zone 11
Minimum winter temperature: 40 	toF to 50 	toF
Average last frost: None
Average first frost: None
Growing season: 365 days
USDA Hardiness Zone 12
Minimum winter temperature: 50 	toF to 60 	toF
Average last frost: None
Average first frost: None
Growing season: 365 days
USDA Hardiness Zone 13
Minimum winter temperature: 60 	toF to 70 	toF
Average last frost: None
Average first frost: None
Growing season: 365 days