• Texas A&M Forest Service
  • Texas A&M Veterinary Medical Diagnostics Laboratory
  • Texas A&M AgriLife Extension Service
  • Texas A&M AgriLife Research
  • Texas A&M College of Agrculture and Life Sciences
Texas A&M College of Agriculture and Life Sciences

Viticulture & Enology

Growing Grapes and Making Wine

  • Menu
  • Home
  • Viticulture
    • Viticulture Resources
    • Viticulture Educational Programs
  • Enology
    • Enology Educational Opportunities
    • Enology Resources
      • External Resources
        • Winery Equipment
        • Starting a Winery
      • Internal Resources
  • Our Specialists

2020-2021 Bud Cold Hardiness

December 4, 2020 by abotezatu

This information is provided as a service by Texas A&M AgriLife Extension Service with partial funding from the High Plains Winegrowers Association. Texas A&M AgriLife Extension Service is not responsible for any damage or loss resulting from the use or misuse of this information.

REAL-TIME MONITORING

Critical temperatures for wine grapes are determined using a method called “differential thermal analysis”.  These data are updated approximately weekly from mid-November through mid-March. Data is collected from approximately 40 buds total (node positions 3 to 8) from at least 10 canes per variety on mature vines grown in vineyards in the Texas High Plains AVA.

LT10 = temperature at which 10% of the primary buds will be killed.

LT50 = temperature at which 50% of the primary buds will be killed.

LT90 = temperature at which 90% of the primary buds will be killed.

MAXT = maximum temperature recorded for the day.

MINT = minimum temperature recorded for the day.

If the temperatures recorded for the day decline below the critical temperature (LT), then bud damage has likely occurred. Please review the Grapevine Cold Hardiness factsheet for information on managing cold-damaged vineyards.

Buds are collected from Texas A&M AgriLife vineyard in Lubbock, Texas.

12/1/2020 LTE10 (°F) LTE50 (°F) LTE90 (°F)
Aglianico 19.04 9.41 3.36
Cabernet-Sauvignon 15.49 10.74 7.43
Marsanne 12.81 5.90 3.51
Montepulciano 15.91 8.58 3.18
Roussanne 9.12 4.95 2.43
12/8/2020      
Aglianico 13.15 9.37 0.91
Cabernet-Sauvignon 11.50 7.43 2.44
Marsanne 8.35 2.16 -1.77
Montepulciano 9.57 2.59 -0.36
Roussanne 6.28 2.59 0.10
12/15/2020      
Aglianico 10.90 4.68 3.24
Cabernet-Sauvignon 9.52 4.82 2.01
Marsanne 6.55 1.99 -3.95
Montepulciano 5.25 2.03 -2.20
Roussanne 4.44 1.42 -1.08
12/22/2020      
Aglianico 5.45 2.46 -2.49
Cabernet-Sauvignon 5.63 3.78 0.27
Marsanne 4.73 1.49 -2.13
Montepulciano 4.06 -0.54 -3.55
Roussanne 4.33 1.42 -0.06
1/5/2021      
Aglianico 3.34 -0.26 -3.53
Cabernet-Sauvignon 1.98 -1.75 -7.28
Marsanne 2.39 -2.34 -5.44
Montepulciano 1.35 -3.05 -6.38
Roussanne 0.68 -2.94 -8.10
1/19/2021      
Aglianico 1.58 -2.79 -7.53
Cabernet-Sauvignon 0.21 -3.75 -8.93
Marsanne 0.41 -3.62 -8.66
Montepulciano 1.17 -2.99 -5.82
Roussanne 0.75 -5.10 -9.62
2/9/2021      
Aglianico 2.52 0.73 -0.87
Cabernet-Sauvignon 2.05 -3.12 -8.68
Marsanne 4.37 0.30 -8.34
Montepulciano 2.43 -2.72 -5.66
Roussanne 3.07 -0.54 -6.16
2/23/2021      
Aglianico 3.20 3.16 -1.28
Cabernet-Sauvignon 2.46 -0.58 -3.41
Marsanne 4.87 0.34 -4.22
Montepulciano 1.20 -2.38 -6.18
Roussanne 3.94 -0.27 -3.69
3/30/2021      
Aglianico 16.97 14.49 12.90
Cabernet-Sauvignon 17.49 16.00 13.08
Marsanne 20.34 17.74 15.35
Montepulciano 17.17 15.19 12.94
Roussanne 20.37 17.74 15.58

Filed Under: Uncategorized

Social Media

  • facebook
  • youtube
  • instagram
  • Compact with Texans
  • Privacy and Security
  • Accessibility Policy
  • State Link Policy
  • Statewide Search
  • Veterans Benefits
  • Military Families
  • Risk, Fraud & Misconduct Hotline
  • Texas Homeland Security
  • Texas Veteran's Portal
  • Equal Opportunity
  • Open Records/Public Information

The Texas A&M System is an Equal Opportunity/Affirmative Action/Veterans/Disability Employer committed to diversity.

Texas A&M University System Member