Home / Guides / Fruits, Nuts & Perennial Crop Calendars
Fruits, Nuts & Perennial Crop CalendarsGrape Calendar: Table vs. Wine
Grapes are one of the most calendar-driven fruit crops, but the calendar is set by the vine's stages, not by dates. Here is how table and wine grapes differ and where they overlap.
Key points
- Follow vine stages, not dates.
- Table and wine goals set different harvest triggers.
- Prune after deep cold passes and judge bud injury first.
- Open canopies reduce disease pressure.
What are the stages of the grape year?
A vine moves from dormancy to bud break, shoot growth, bloom, fruit set, veraison (when berries begin to color and soften) and then ripening and harvest. After harvest the leaves drop and the vine heads back to dormancy. Extension labor calendars from Missouri and the Midwest lay these out in order.
Knowing the stage matters more than knowing the date, because a warm spring can advance bud break by weeks. Keep notes of when each stage arrives in your vineyard.
Spend a season walking the rows weekly with a notebook and a phone camera. Photos of bud break, bloom and veraison give you a visual record you can compare from year to year, and they help you explain problems to an extension adviser.
How do table and wine grapes differ?
Table grapes are grown for fresh eating and are judged on size, appearance and eating quality. Wine grapes are grown for sugar, acid and flavor that suit a winemaker's goals. Some varieties serve both ends, such as certain hardy American hybrids.
Your market sets your calendar. A table grape grower picks when fruit tastes right, while a wine grower may pick by measured sugar and acid. Wine production is also regulated, so check state and federal rules before selling.
If you are new, start with a variety recommended by your extension office for your winter lows and rainfall. A well adapted grape in an ordinary year beats a famous grape that struggles in your climate.
When should you prune grapevines?
Dormant pruning is the main job and is usually done after the coldest part of winter and before buds swell. Grapes fruit on one-year-old canes, so pruning decides how much fruit the vine can carry. In very cold regions, wait until you can judge winter bud injury before making final cuts.
Oregon State and South Dakota State guides emphasize not being timid. Removing most of last year's growth feels harsh but produces better fruit. Pruning methods differ by variety and training system, so follow a local guide.
- Cut after the hardest cold has passed
- Assess bud injury in cold regions before finishing
- Leave a limited number of buds per vine, per local guidance
What are the main frost and cold risks?
Spring frost after bud break can kill new shoots and reduce the crop. Winter cold can kill buds or whole vines, depending on variety. Choose varieties rated for your winter lows and consider a site with good air drainage.
Do not mistake the hardiness zone for a frost date. The zone describes the average coldest winter temperature. For spring frost, use local frost dates from NOAA or extension and watch the forecast as buds swell.
What about disease and canopy management?
Grapes are prone to fungal diseases in humid weather, including powdery mildew, downy mildew and black rot. Open canopies dry faster, so shoot positioning and leaf removal near the fruit zone help. Good airflow starts with training the vine properly.
Fungicide timing is stage based and changes with local conditions. This guide gives no product names or rates. Consult your extension grape guide, follow the label, observe pre-harvest intervals and protect pollinators.
How do you tell when grapes are ready?
After veraison, berries soften and color, and flavor develops over several weeks. Taste berries from different parts of the cluster. Seeds should turn from green to brown, and the stem near the cluster begins to turn woody. Grapes do not ripen further after picking.
For wine grapes, ask extension or a local winery about measuring sugar and acid. For table grapes, taste is the main test. Birds and wasps usually signal that the crop is ripe, so net early.
How do you plan your vineyard year?
Winter is for pruning and trellis repair. Spring is for bud break watching and frost response. Early summer is for canopy work and disease monitoring. Late summer is for ripening checks, netting and harvest, and fall is for cleanup.
A first-year vine needs patience. Most guides recommend not letting a young vine carry a full crop, so check local advice for how long to wait. A good calendar starts with healthy vines, not early fruit.
Plan for a few years before a meaningful crop. Vines need time to build roots and trunks, and a patient start usually pays back later with healthier plants and steadier yields.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.