Can you live off-grid in Johnston County, Oklahoma?
95
of 100
Strong
Yes, with one thing to plan around. Water is easy here, with about 42 inches of rain a year and wells near 90 feet. The growing season runs about 225 frost-free days. NOAA counts about four strong tornadoes a decade within 25 miles, so a storm shelter belongs in the plan.
What the land says
Rain
Rain can supply much of a household's water with a large tank. A garden mostly waters itself in normal years.
About 42 inches a year (PRISM, 1991 to 2020 average)
Wells
Shallow wells, so drilling should be one of the cheaper costs.
The typical well here is about 90 feet deep; a well typically runs $4,000 to $10,000
Growing season
A full season for most vegetables.
About 225 frost-free days, USDA zone 8a; last frost about March 28, first about November 9
Sun
Good sun. Size the array and battery bank for winter.
About 5.3 hours of full sun a day, averaged over the year
Flood
Flood zones run along creeks and rivers here. Look up the parcel on FEMA's flood map.
FEMA maps flood zones within a quarter mile across much of the county
Wildfire
Low wildfire risk.
U.S. Forest Service wildfire hazard map: Very Low to Low here
Storms
Strong tornadoes are common. A storm shelter belongs in the plan.
NOAA: no hurricane-strength storm within 50 miles since 1975; about 4 strong (EF2 or stronger) tornadoes a decade within 25 miles
Terrain
Flat to gentle, easy to build on.
Slopes average about 6%, about 750 feet above sea level
Soil
Good ground for a standard septic system. The county's soil test decides.
Loam, well drained (USDA soil survey). A standard system typically runs $5,000 to $10,000
Road
Paved roads are close by.
Nearest paved road usually within about 0.3 miles (OpenStreetMap)
Check an Oklahoma parcel, or plan the one you own
Get a free 0-100 off-grid score.
A step-by-step build plan, sizing your solar, water, garden, septic, heat, and buildings.
Is it legal here?
Zoning
Rural land here is often unzoned. Confirm with the county before you build.
Building code
Oklahoma has a statewide minimum residential code, the 2024 International Residential Code since September 2026. Cities and counties with a building department enforce it; where a rural area has none, there is usually no permit for the house itself, but the code still applies.
Rainwater
Collecting it is allowed.
Composting toilets
Allowed.
Water rights
A mix of two systems. Ask the state water office before you drill a well or dam a creek.
Drilled to about 90 feet, with pump and pressure tank
Septic
$5,000 to $10,000
Standard system
Solar and batteries
$18,000 to $34,000
Sized for a modest household
Road or driveway
$3,000 to $7,000
From the nearest road to a house site
Clearing
$1,000 to $4,000
A house site, solar, and garden
Total
$31,000 to $64,000
Before the house
Before you make an offer on land here
Flood map
Look up the parcel on FEMA's flood map.
Flood zones run along creeks and rivers here. Building in one means flood insurance and extra permits.
Zoning
Confirm with the county whether the parcel is zoned.
Rural land in Oklahoma is often unzoned.
Soil test
Get a soil test before you count on septic.
The county has to approve the ground before it issues a septic permit.
Nearby counties
10,216 people live in Johnston County, about 15.9 per square mile. It ranks tied for 3rd of the 77 Oklahoma counties we scored, and Oklahoma ranks 13th of 50 states.