Jun 9, 2025California almond growers manage weather swings, prep for hull split
California almond growers navigated a month of fluctuating temperatures and brisk winds throughout May, as they focused on irrigation, fertilization and pest monitoring in advance of the upcoming hull split.
According to the latest crop progress report from Blue Diamond Growers’ field department, temperatures in the Central Valley ranged from the upper 60s to over 100 degrees, with peak highs reaching 105 on the final day of May. Morning lows were more stable, hovering in the upper 50s to upper 60s. Light rain was recorded early in the period in parts of the Sacramento Valley, totaling only a few hundredths of an inch.
Observers noted that almond kernels across all varieties became fully solidified during this period, reaching maximum weight. Although the USDA has forecasted a below-average yield, growers with younger orchards reported solid crop potential. Some have trimmed branch ends to reduce weight and prevent limb breakage. Older orchards, by contrast, are showing lower production levels.
Fertility practices remain steady. Most growers aim to complete nitrogen applications by the end of May to reduce the risk of fungal infections after hull split. Some have adopted continuous fertigation, applying smaller amounts of nitrogen weekly, which may extend closer to hull split without increasing disease incidence.
Pest pressure remains moderate. Trap counts for navel orangeworm (NOW) moths are currently low. However, monitoring efforts are expected to ramp up as the crop nears hull split. Pest Control Advisors continue to watch for plant bug species and recommend vigilant scouting.
Growers and observers also noted ongoing orchard removal and replanting, particularly in the northern San Joaquin and Sacramento valleys. Newly planted trees were often painted white to protect against sun damage and support early root development.
Despite improving market prices, neglected or abandoned orchards remain an issue throughout the Central Valley. These orchards pose risks by potentially harboring NOW as the season advances.
Growers are now turning their attention to hull split preparation and harvest readiness in the coming weeks.
