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College of Food, Agricultural, and Environmental Sciences



Freeze Watch: April 24, 2024

April 24, 2024 - 10:46am --

By: Maria Smith, HCS-OSU

Buds are breaking across Ohio and here in Wooster (Fig. 1), but frost risk looms again tonight. A few regions of Ohio reached damaging temperatures for green tissues on the morning of April 22 (Fig. 2), with minor damage observed in some vineyards in Central and Southern Ohio.

2023 Year in Review

January 8, 2024 - 4:15pm --

By Imed Dami and Diane Kinney, HCS-OSU

This article summarizes the 2023 dormant and growing seasons and the impact of weather on grape varieties grown on the research vineyard at the OSU-OARDC in Wooster, Ohio.

Weather: Temperature

USDA Announces 2023 Updates to the Plant Hardiness Zone Maps

November 17, 2023 - 10:31am --

By: Maria Smith, HCS-OSU

The new USDA plant hardiness zone maps have been updated for 2023 and were released this week. These updates occur approximately every 10 years, with the last maps released in 2012. The following press release from the USDA provides explanation for how the new zones are calculated and the 30-year timespan of winter minimum temperatures used to calculate the new zones.

July and August Vineyard Updates

August 21, 2023 - 1:36pm --

By: Maria Smith, HCS-OSU

In Wooster and throughout much of Ohio, we’re here: veraison (Fig. 1), the onset of the ripening period. During veraison, the berries will begin to change color, soften in texture, and expand in size. This is also the time when grower efforts earlier in the season will pay off in yield and quality outcomes of the mature grapes. Today in Wooster also marks our first harvest of the season with very early ripening Brianna (Fig. 1).

Aftermath of the frost event on 18 May 2023

May 30, 2023 - 3:05pm --

By: Imed Dami and Maria Smith, HCS-OSU

Freeze advisories were issued the week of May 15 and temperature dropped below freezing on May 18. The lowest temperatures ranged between 28 oF and 31 oF. These freeze events were thankfully not widespread and occurred mainly in northeast Ohio (see map below). Note that this was the latest freeze since 26 May 2013 for Wooster and the second latest freeze on record since 1997. 

May 2023 Vineyard Updates

May 17, 2023 - 8:32am --

By: Maria Smith, HCS-OSU

With the frost risks largely in the rear-view of April, we are starting to see new shoot growth bolt ahead under warming temperatures of the past week (Figure 1). Keep in mind, if you did have damage from those late-April freeze events, you may just be starting to see the emergence of secondary and tertiary shoots (Figure 2).


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