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Chill Hour and Chill Portion Comparison
Below is a chart created by Dr. Greg Reighard that makes a general comparison between chill hours and chill portions. Please keep in mind that currently, no actual conversion can be made from chill hours to chill portions or vice versa. The chart is based on field observations which were related to both chill hour and chill portions accumulation. Observations will continue over the years so that a clearer picture of the relationship between chill portions to chill hours can be developed.
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Chill hours and corresponding chill portions required by February 15 |
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Chill Hours Needed |
Corresponding Chill Portions |
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650 hours |
~30-35 |
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750 hours |
~35-40 |
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800 hours |
~40-45 |
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850 hours |
~45-50 |
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950 hours |
~50-55 |
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1050 hours |
~55-60 |
Estimated Chill Portion Requirement Per Variety
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Estimated |
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Chill Portion |
Chill Hour |
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Requirement |
Variety |
Season |
Require. |
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30 - 35 |
June Gold |
Early |
650 |
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Juneprince |
Early |
650 |
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Clemson Pride |
Mid |
700 |
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Desiree |
Early |
700 |
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Dubois |
Mid |
700 |
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Flavor Rich |
Early |
700 |
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35 - 40 |
Harvester |
Mid |
750 |
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Bounty |
Mid |
800 |
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Loring |
Mid |
800 |
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O'Henry |
Late |
800 |
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40 - 45 |
Blazeprince |
Late |
850 |
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Caro Tiger |
Late |
850 |
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Challenger |
Mid |
850 |
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Elberta |
Late |
850 |
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Fireprince |
Mid |
850 |
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Flameprince |
Late |
850 |
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Julyprince |
Mid |
850 |
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Parade |
Late |
850 |
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Ruby Prince |
Early |
850 |
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Scarletprince |
Late |
850 |
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Winblo |
Mid |
850 |
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PF Lucky 13 |
Mid |
900 |
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Scarlet Rose |
Mid |
900 |
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45 - 50 |
Red Haven |
Mid |
950 |
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Big Red |
Late |
1000 |
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Fairtime |
Late |
1000 |
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Intrepid |
Mid |
1000 |
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55 - 60 |
July Rose |
Mid |
1000 |
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Big George |
Late |
1050 |
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Contender |
Mid |
1050 |