As summer embraces Paso Robles, activity hums through vineyards and wineries. With harvest still months away, August finds vineyard managers and winemakers deep in crucial work, shaping the 2025 vintage, nurturing 2024 wines, and preparing 2023 reds for release. This highlights the meticulous care that defines Paso Robles wine country.

The spring and early summer months are crucial for the upcoming vintage, as weather significantly influences vine growth, fruit development, and soil moisture. This year, we’ve seen few frost events, which is great news. However, cool, unstable weather prevailed through May and into June. Currently, Growing Degree Day accumulation (a measure of heat accumulation vital for grape development) is just above 2024 levels but still lower than average. Vine growth, initially slow in May, caught up well in June thanks to near-normal temperatures.

Out in the vineyards, the focus is on managing the leafy canopy and optimizing the fruit for the upcoming 2025 harvest. The season’s cool start has been good for grapevine leaf and shoot growth, especially given less winter rain than usual. However, this cooler beginning could make vines less resilient to heat waves that might arrive closer to harvest, as grapes and vines generally prefer some early season warmth to get used to the heat.

Many vineyard teams have completed shoot thinning, an important early task that removes extra new shoots, directing vine energy towards a balanced crop. Leafing, or removing leaves, is either in full swing or almost done. This strategic removal of leaves around the grape clusters is vital for letting air circulate, which greatly reduces disease risk, and for allowing sun exposure, leading to more even ripening and better flavor. Crews are actively performing various canopy adjustments now, including leafing, pulling off side shoots (laterals), and some hedging (trimming), all designed to make the vine put its energy into developing the grapes. This careful balancing of the vine’s energy—between roots, leaves, and fruit—is crucial, with the current focus firmly on the fruit. Crews have been diligently performing cluster thinning to allow for balanced vines.

A common sight this time of year is lifting wires. These movable wires, stored low on the vine during winter, are now carefully raised to position and support the strong, well-developed shoots and leafy canopy. As one local vineyard manager explained, “The shoots/canopy is now strong and has enough caliper that the wires get lifted to have the shoots properly positioned and tucked for VSP-trained blocks.” This practice, especially in vineyards where vines are trained Vertical Shoot Positioned (VSP), ensures orderly vine growth, maximizing sunlight capture and airflow. Additional leafing and canopy work will continue over the next few weeks.

Paso Robles vineyard managers are also deep into counting grape clusters and estimating the size of the harvest, closely monitoring how berries are growing after fruit set (when flowers turn into tiny berries). These early predictions are critical for anticipating the size of the 2025 harvest and guiding future winemaking decisions. Overall fruit set is normal, though there’s specific variation in Cabernet Sauvignon. The weaker set in Cabernet Sauvignon reminds some of last year, leading to hopes it won’t be combined with late-season heat waves as happened in Fall 2024. As one report indicated, “General remarks are for Paso is that the crop is average to average plus… meaning the yields look strong and consistent with little-to-no shatter.” Despite a cooler growing season so far, the 2025 vintage shows immense promise, with some comparing its potential to a mix of the previous two vintages – much can still change before harvest, but the foundation for an exciting season is certainly being laid.

This is also the time of year growers diligently watch for mildew growth, manage weed growth under vines, and begin to look at irrigation management based on soil moisture and weather patterns. Potassium fertilizer is also being applied after fruit set, as the developing grapes demand more of this nutrient. Many vineyards are now preparing bird protection strategies, like netting or innovative bird lasers, to deter birds from feasting on ripened grapes. With veraison (when grapes begin to change color and soften) on the horizon, vineyard teams are patiently waiting the crucial 45-60 days from veraison to harvest, carefully monitoring fruit progress.

A significant trend in Paso Robles is the move towards more sustainable and regenerative farming practices, with a strong focus on improving soil health. Compost is increasingly used to fertilize and enhance soils, and cover crops, planted earlier, are now mowed for the summer, aiding soil stability and benefiting soil microbes. Many growers are also opting for non-synthetic fertilizers and fungicides. These practices are key to ensuring vineyards and their soils remain healthy, consistently producing high-quality grapes for years to come. Underlying all this meticulous work is a constant eye towards preparing for the upcoming crush (harvesting and processing grapes), with thorough cleaning of all vineyard equipment already underway, ensuring smooth operations for another exciting harvest.

While vineyards are active, Paso Robles wineries are quietly hard at work. As one local winemaker put it, “In the winery, we’re fully immersed in the rhythm of the season, with both the vineyard and wine cellar humming with activity.” In the cellar, winemakers are diligently topping off barrels, a crucial practice to prevent oxygen from spoiling the wine and to ensure the pristine quality of the 2024 vintage. These young wines are maturing gracefully, already showing vibrant depth and freshness. As 2024 red wines mature in barrel, many wineries are engaged in initial blending trials, providing a glimpse into what finished wines could be like in the next 12 months.

Simultaneously, focus is on the culmination of the 2023 vintage, particularly the red wines. Winemakers are in the final stages of blending, meticulously tasting and adjusting for ideal flavor and texture balance. The 2023 reds generate significant excitement, showcasing bold, structured profiles that point to an exceptional vintage for the area. “Our reds are showcasing bold, structured profiles in what looks like an exceptional vintage for the area,” one winemaker shared. The 2023 vintage is often likened to 2011, characterized as a cooler year than typical in Paso Robles.

Bottling is now in full swing. This labor-intensive process is carefully monitored at every step to preserve wine quality, ensuring the finished product reflects the hard work of its creation. From vine to bottle, the passion of Paso Robles winemakers is evident, promising a delightful experience for wine lovers in years to come.