Abstract: Cold hardiness for seven introduced almond cultivars was evaluated by winter injury index, trunk cambial browning (TCB) and electrolytic conductance test ( EC) with logistic equation. The results showed that the low temperature for 50% ( LT50) of one􀀁year excised dormant shoots from young tree to be killed was - 18. 0 to - 24. 5. Classificat ion of cold hardiness of these cultivars was evaluated by system analysis, the results were as follows: 1) the hardy cultivars included Butte and Padre which could bear - 24. 5 􀀂 ; 2) Nonpareil, Price and Monterey belonged to the medium hardy ones, whose LT50 was about - 20. 9; 3) the tender cultivars included Ne Plus and Sonora whose LT50 was about - 18. 3.

Key words: Almond, Winter injury index, Low􀀁, temperature for 50% killed ( LT50), Cold hardiness