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 |
