Spring and fall are different calculations
Start with your local frost date
Texas is too large for one planting day. Spring timing is measured from the local average frost-free date. Fall timing is measured backward from the local first freeze, then checked against the Texas A&M regional anchor when one is published.
Spring rule
2–8 weeks after the local frost-free date
Use the frost-free date for your garden, not a statewide average.Fall rule
Routine fall planting not recommended
Count backward from the local first freeze and leave room for establishment.Texas A&M gardening regions
Regional planning anchors
Texas A&M gives a frost-relative spring rule rather than a Region I–V calendar date for sweet potatoes. The same offset produces different dates because each region has a different frost-free pattern.
Region I
Spring: 2–8 weeks after local frost-free date
Northern Panhandle; use the local date and warm-soil conditions.Region II
Spring: 2–8 weeks after local frost-free date
West Texas and the High Plains; use the local date and warm-soil conditions.Region III
Spring: 2–8 weeks after local frost-free date
North, East and Central Texas; use the local date and warm-soil conditions.Region IV
Spring: 2–8 weeks after local frost-free date
South Texas; use the local date and warm-soil conditions.Region V
Spring: 2–8 weeks after local frost-free date
Lower Rio Grande Valley; use the local date and warm-soil conditions.Plant only when the crop is ready
The calendar is the first filter
A date can be inside the planning range and still be a poor planting day. Check the crop-specific conditions before committing seed or plants.
- The soil and nighttime pattern are reliably warm.
- Healthy slips are available and not cold-stressed.
- Enough warm growing time remains for the selected variety.
Method changes timing
How to start sweet potatoes
Sweet potatoes start from slips and need a long warm season. They are not Irish potatoes and do not use the seed-tuber schedule.
Use slips
Do not plant Irish seed-tuber pieces or treat sweet potatoes as a seed-sown crop.
Wait for real warmth
The frost-free date is only the starting reference; cold soil can stall or injure slips.
Protect the full season
Choose a planting date that leaves enough warm time for root development before autumn cooling.
When the simple answer breaks
Early and late decisions
A usable planting page needs an action when weather, region or maturity no longer fits the headline range.
Cool spring after frost-free
Wait within the 2–8 week range
The later side is safer when nights and soil remain cold.Proposed fall crop
Do not publish a window
The Texas home guide marks fall planting not recommended; use spring unless a specific local source supports an exception.Why this answer is shaped this way
Spring-only is useful information
A page does not need two seasons to be complete. Refusing an unsupported fall window prevents wasted slips and keeps sweet potatoes distinct from fall Irish potato guidance.