Last updated: June 2025
GardenCalc provides free online gardening calculators for informational and educational purposes only. All results — including plant counts, soil volumes, frost dates, fertilizer rates, and planting schedules — are estimates based on established horticultural guidelines and publicly available climate data. They are not a substitute for professional horticultural advice.
Gardening outcomes depend on many factors beyond what any calculator can account for — local soil conditions, microclimates, pest and disease pressure, seasonal weather variation, and specific plant varieties. GardenCalc makes no guarantee that following calculator outputs will result in a successful harvest or desired garden outcome.
Frost dates are derived from NOAA's 30-year climate normals and are statistical averages. Actual frost dates in any given year may differ significantly from these averages. USDA Plant Hardiness Zone data is based on the 2023 USDA zone map. Plant spacing and soil volume recommendations follow university extension service guidelines but may not apply to all growing conditions or varieties.
GardenCalc may contain links to third-party websites including seed suppliers, garden retailers, and product listings. These links may be affiliate links, meaning we may earn a small commission if you purchase through them at no extra cost to you. We are not responsible for the content, accuracy, or practices of any external website.
Nothing on GardenCalc.com constitutes professional horticultural, agricultural, or landscaping advice. If you are undertaking a large-scale planting project, commercial growing operation, or have specific plant health concerns, please consult a qualified horticulturalist or your local cooperative extension service.
Questions about this disclaimer? Contact us at: hello@gardencalc.com