Yellow sac spiders in Texas
Yes — yellow sac spiders are recorded in Texas. The GBIF biodiversity database holds 111 verified yellow sac spider records from the state — one of the highest counts in the country. Sightings concentrate in April to June. Onset: stinging pain at the time of the bite. Duration: about a week.
| Verified records | 111 |
|---|---|
| Peak sightings | April to June |
| State bite season | February to December |
| Active | night |
| Habitat | ceiling corners, curtain folds and wall junctions indoors; this is a common household spider nationwide |
| Bite appears | stinging pain at the time of the bite |
Yellow sac spider bites in Texas: what the mark looks like
Small, pale yellow-green, and the spider most likely to bite a sleeping person indoors. The bite stings at the time, unlike a bed bug, and appears singly rather than in a line — the two are otherwise easy to confuse because both happen overnight on uncovered skin.
Locally, the species most often confused with it are black widow spider bite, brown recluse spider bite, chigger bite — all of which are also recorded in Texas.
Seek medical care if
- an enlarging ulcer
- spreading redness with fever
What else it could be in Texas
These are recorded in Texas too and are the ones most often confused with it here. The differences below are the ones that actually separate them.
| Yellow sac spider bite | Brown recluse spider bite | Bed bug bite | |
|---|---|---|---|
| Pattern | single, sometimes two nearby | single site | lines or zigzags of three or more — the classic "breakfast, lunch and dinner" |
| Where on body | neck, arms, torso — often bites received in bed | torso under clothing, upper arms, thighs — often where clothing was put on with the spider inside | arms, shoulders, neck |
| Appears | stinging pain at the time of the bite | often painless at first | hours to several days — many people notice nothing on the first night |
| Records here | 111 | 1,203 | 67 |
Yellow sac spider season in Texas specifically
Records in Texas concentrate in April to June, which is what local sighting data shows rather than a national average — seasonality shifts substantially with latitude. The general bite season in Texas runs February to December.
Because ceiling corners, curtain folds and wall junctions indoors, exposure in Texas tends to be concentrated in specific places rather than spread evenly — which is why a bite history ("where were you in the 24 hours before?") narrows the answer faster than the appearance of the mark.
Month by month in Texas
These are the 111 Texas records broken out by the month they were recorded — not a national curve redrawn for the state. Records appear in 2 of the 12 months here. The single busiest month is July with 2 records (67% of the state total).
| Month | Records | Share |
|---|---|---|
| June | 1 | 33% |
| July | 2 | 67% |
Counts are observations submitted to GBIF, not bites. They tell you when the animal is out and being noticed in Texas; they do not tell you how many people were bitten. The thinnest month with any record at all is June (1).
How Texas compares
Across the 47 states with any yellow sac spider records, Texas ranks 5th with 111. The state directly above it is Pennsylvania (124). Directly below is Ohio (99). The highest count anywhere is California (427).
Inside Texas itself the picture is different again: of the 22 biting species we track with records here, this one is 14th and accounts for <1% of the 70,626 records logged in the state. A species can be common nationally and marginal in one state, or the reverse — which is the whole reason this page exists separately from the national guide.
Care
- wash, cold pack, antihistamine if itchy
- keep the area clean while it heals
Avoiding yellow sac spiders in Texas
- vacuum ceiling corners and behind curtains
- seal gaps around window frames
Questions
Are there yellow sac spiders in Texas?
Yes. Texas accounts for 111 verified records in GBIF, ranking it 5th among the 47 states with any records for this species, just behind Pennsylvania (124). Within Texas it is 14th of the 22 biting species we track here, at <1% of the state's records. Records reflect reporting effort as well as abundance.
When are yellow sac spiders active in Texas?
Texas records peak in April to June. The general bite season in Texas runs February to December.
What does the bite look like?
a red, tender bump, occasionally with a small blister, red, sometimes with a pale centre. Single, sometimes two nearby.
Which month has the most sightings in Texas?
July, with 2 of the 111 Texas records (67%). Records appear in 2 of the 12 months here. This counts sightings submitted to GBIF, not bites.
Get a photo assessment in the app
Everything above is free to read. The app adds what a page cannot: point your camera at the bite and get an assessment of the most likely cause, a severity read, and a day-by-day care plan — including the specific signs that mean you should be seen.
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