Data Story
How Elevation Shapes Your Growing Microclimate
Source: USGS 3D Elevation Program (3DEP) National Elevation Dataset, streamed from public Cloud Optimized GeoTIFFs at ~10 m resolution.
Analyzed by Growable Ground, May 2026.
3DEP Resolution
~10 m
1/3 arc-second NED
CONUS Coverage
100%
USGS National Map
Cold-Pocket Lag
2-3 wks
Valley vs ridge frost timing
The Cold-Pocket Effect
On clear, still nights, cold air behaves like water — it drains downhill and pools in low spots. A parcel at the bottom of a shallow bowl can run 5-10°F colder than a parcel 200 feet up the same hillside.
That difference shifts last-spring-frost dates by 1-3 weeks and shortens the frost-free growing season at the bottom of the bowl. NOAA weather stations rarely sit in cold pockets — your local frost date estimate may not see what your parcel actually feels.
Key Statistics
Elevation and Growing Microclimate
- USGS 3DEP NED 1/3 arc-second tiles cover 100% of the continental US at roughly 10-meter resolution — fine enough to see the dip behind a hedgerow.
- For every 1,000 feet of elevation gain, average temperature drops about 3.5°F (dry adiabatic lapse rate, USDA Forest Service). At the parcel scale, elevation differences of 50-200 ft still meaningfully shift growing conditions through cold-air drainage.
- Cold-air pooling can drop nighttime minimums in a valley by 5-10°F on clear, calm nights — moving an apparent USDA hardiness zone half a step colder for the same latitude and longitude.
- Hillsides between 10 ft and 200 ft above a valley floor commonly avoid the worst frost pockets while keeping water access — historically prized growing ground in orchard regions.
- The same dataset that drives shadow casting, slope, aspect, and watershed flow direction also powers cold-pocket detection — one stream of elevation pixels, many interpretive layers.
Why Elevation Matters for Growers
Two parcels on the same road, at the same latitude, with the same nominal hardiness zone can ripen tomatoes a full month apart. The lower parcel sits in a cold pocket; the upper parcel catches morning sun and sheds frost early. Zone maps and ZIP-code frost tables can’t see this. Elevation data can.
Knowing your parcel’s elevation profile lets you plant frost-sensitive crops on the warmer shoulders of a slope, reserve the cold pocket for late-season hardy greens, and choose varieties matched to the growing season your land actually delivers.
See Your Parcel’s Elevation Profile
See USGS 3DEP elevation, slope, and cold-pocket risk for your specific parcel
Enter your address for elevation data, slope, aspect, and 1,112 plant matches scored against your actual microclimate.
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Frequently Asked Questions
What is USGS 3DEP?
The 3D Elevation Program (3DEP) is the USGS national elevation dataset, built primarily from airborne LiDAR. The 1/3 arc-second product covers the continental US at roughly 10-meter resolution and is the federal standard for elevation analysis.
Why is elevation more useful than just my ZIP code’s frost date?
A ZIP code can span hundreds of feet of elevation across hills, valleys, and ridges. The published frost date averages across all of that terrain. Your specific parcel may sit in a cold pocket that runs weeks colder than the ZIP-code average, or on a warm shoulder that runs weeks warmer.
How does Growable Ground use elevation data?
We stream native-resolution 3DEP tiles for your parcel and sample multiple points across the polygon to compute elevation range, slope, aspect, and a frost-pocket risk indicator. Those values feed cold-pocket flagging, shadow casting, drainage modeling, and plant suitability scoring throughout your report.