Chill Hour Numbers 2024-2025

Chill Hours (Using the under 45 F method) 11/15/2024 Start

852

Chill Hours (Using the 32-45 F Model) 11/15/2024 Start

575

Chill Hours (Using the under 45 F method) 12/14/2024 Start

690

Chill Hours (Using the 32-45 F Model) 12/14/2024 Start

423

Why two numbers?
We had a similar problem like this in 2022-2023. For a while I thought the November start date wasn’t accurate, because some Texking and Zest series started blooming in late January 2023. The chill hours around that time were 563 for November start (11/15/2022), 387 for December start(12/15/2022, hit 27 F). So the November start date looked accurate at that point. However, later on that year the higher chill peaches acted as if they didn’t get enough chill hours, and TAMU AgriLife even came out with an article about it later (https://agrilifetoday.tamu.edu/2023/04/18/chill-hours/). So both numbers will be reported until the end of the chilling season.

Last updated on 2/28/2025.

Historic Chill Hour Readings using the 45 F method for Fredericksburg:
2023-2024 Season: 697
2022-2023 Season:672 (December start reflected tree condition more accurately than starting arbitrarily on Nov. 15th)
2021-2022 Season: 814
2020-2021 Season: 1037
2019-2020 Season: 992 (1013)
2018-2019 Season: 1039
2017-2018 Season: 967
2016-2017 Season: 460
2015-2016 Season: 819
2014-2015 Season:948
2013-2014 Season:1094
2012-2013 Season:1182
2011-2012 Season:950
2010-2011 Season:1000