Abstract
Global climate is supposed to get warmer the next decades. In Western Norway the average temperatures are suggested to increase about 1.0°C until 2050 and about 2.6°C until 2100, compared to 1980-2000. Data on strawberry yield were obtained from commercial strawberry growing in open field in the valley of Valldal in the fjord district of Norway for the years 1970-2000. These long time series were used for developing regression models to explain the effect of changing climate on harvest time for the strawberry cultivar 'Senga Sengana'. The mean temperatures per month for May, June, and July were crucial for the time of ripening. If the start of the harvest season was defined as the day of 5% accumulated yield, the average date for the start of the season was about July 18 in this district for the last 40 years. According to the predicted climate change and the regression models the strawberry season will start on average 6 days earlier in 2050 and 22 days earlier in 2100 compared to the average of 1970-2000, provided that the cultivars are similar to 'Senga Sengana' and that the cultural techniques are about the same as now. The harvest season was predicted to be on average about 4 days shorter in 2100 than in 1970-2000.
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