Frost date
/frɔst deɪt/
Definition
Frost date refers to the average calendar date of the last spring frost or the first fall frost at a specific location. It is a climate-based gardening concept, not a fixed annual event. The date is calculated from long-term weather records and estimates when air temperatures near ground level may drop low enough to damage or kill frost-sensitive plants, so actual frost can occur earlier or later in a given year.
Use in Gardening
- Planting schedule anchor: Gardeners use frost date to time sowing, transplanting, and hardening off so tender crops are not exposed to damaging cold too soon.
- Crop choice and season length: It helps match vegetables, annuals, and perennials to a local growing season, especially for plants that need many warm days to flower or ripen fruit.
- Microclimate differences: Local conditions can shift risk by several days or more. Low spots, exposed sites, and urban areas may experience different freezing patterns than a regional average suggests.
- Protection planning: Knowing the likely window supports practical steps such as row covers, cloches, or delaying planting when a late spring event could injure new growth, buds, or blossoms.
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