Check your Climate Drift
Climate Drift is an area-level trend: it compares the last ten years of nearby frost patterns with a thirty-year baseline to show whether the local frost-free season has tended to grow longer, shorter, or stay steady. It is not a thermometer reading from your garden or a prediction for this year.
Zones and frost dates are two different things
USDA hardiness zones answer a survival question: which plants can live through your winter. A zone is set by the single coldest night of an average winter, it says nothing about when spring begins, when fall ends, or when to plant anything.
Frost dates answer the planting question: when it is safe to sow and how long the harvest can run. Two gardens in the same zone can sit weeks apart. That is why Harvestead plans from the frost record measured for your area, not from a zone line on a map.
And most growers never get past the zone. Zone charts are what everyone finds first, so people assume the dates that come with them are personal to their garden. Even experienced growers catch themselves halfway through a zone lookup, one put it plainly: "I've been looking up info for zone 8. I should probably go back to the zip code then." She was right. The ZIP lookup is where the dates stop being a rule of thumb and become a measurement.
What Climate Drift actually means
We use gridded weather history for the area around the location you provide. For each year, we estimate the last spring freeze, first fall freeze, and the days between them, then compare the recent decade with the longer thirty-year pattern.
The result is a direction and an estimated number of days, not an exact measurement at your latitude and longitude. Nearby hills, valleys, pavement, buildings, water, and cold-air pockets can make your garden different from the surrounding area.
What this number can and can't see
- It estimates your area, not your bed. The finest weather history covers roughly six miles, with a broader reading used where needed. A cold-air pocket at the bottom of a slope, or the warm side of a brick wall, can be too small for that history to see.
- Frost pockets need your eyes. Inside Harvestead, the frosts you report pull your calendar toward your own ground without letting one unusual night throw off the whole season.
- A ZIP covers a wider area. If your ZIP spans a valley and a ridge, share your location instead for a reading closer to your garden.
- Drift is history, not a promise. A longer recent average season does not guarantee next spring. It tells you which direction to lean, and why the printed dates keep missing.