Snakes and spiders in Williamson County, Texas
Williamson County, home of Georgetown, has 25 snake and 78 spider species on record, from 543 licensed snake and 1,795 spider records. Venomous species here: the western diamondback rattlesnake, the Texas coral snake, the broad-banded copperhead, the northern cottonmouth, the southern black widow, the brown recluse and the western black widow.
Are there venomous snakes or spiders in Williamson County?
Yes. The western diamondback rattlesnake: 51 licensed records, 2% of all Texas records of it. The Texas coral snake: 11 licensed records, 2% of all Texas records of it. The broad-banded copperhead: 6 licensed records, 2% of all Texas records of it. The northern cottonmouth: 2 licensed records, 0% of all Texas records of it. The southern black widow: 2 licensed records, 1% of all Texas records of it. The brown recluse: 1 licensed record, 1% of all Texas records of it. The western black widow: 1 licensed record, 1% of all Texas records of it.
What snakes are in Williamson County?
In all, 25 snake species are on the Williamson County list. The most recorded are the western rat snake (78), the plain-bellied watersnake (75) and the rough greensnake (71).
| # | Species | Records | Share of Texas records |
|---|---|---|---|
| 1 | Western rat snake Pantherophis obsoletus | 78 | 4% |
| 2 | Plain-bellied watersnake Nerodia erythrogaster | 75 | 3% |
| 3 | Rough greensnake Opheodrys aestivus | 71 | 8% |
| 4 | Western diamondback rattlesnake venomous Crotalus atrox | 51 | 2% |
| 5 | Western ribbon snake Thamnophis proximus | 45 | 2% |
| 6 | DeKay's brown snake Storeria dekayi | 33 | 3% |
| 7 | Rough earthsnake Haldea striatula | 32 | 2% |
| 8 | Diamondback water snake Nerodia rhombifer | 31 | 2% |
| 9 | Texas blind snake Rena dulcis | 23 | 2% |
| 10 | Coachwhip Masticophis flagellum | 13 | 1% |
| 11 | Blackneck garter snake Thamnophis cyrtopsis | 12 | 3% |
| 12 | Texas coral snake venomous Micrurus tener | 11 | 2% |
| 13 | Eastern hog-nosed snake Heterodon platirhinos | 10 | 2% |
| 14 | Eastern patch-nosed snake Salvadora grahamiae | 9 | 3% |
| 15 | Eastern racer Coluber constrictor | 9 | 1% |
| 16 | Great Plains rat snake Pantherophis emoryi | 9 | 1% |
| 17 | Prairie kingsnake Lampropeltis calligaster | 7 | 3% |
| 18 | Broad-banded copperhead venomous Agkistrodon laticinctus | 6 | 2% |
| 19 | Flathead snake Tantilla gracilis | 3 | 0% |
| 20 | Northern cottonmouth venomous Agkistrodon piscivorus | 2 | 0% |
| 21 | Gopher snake Pituophis catenifer | 1 | 0% |
| 22 | Speckled kingsnake Lampropeltis holbrooki | 1 | 1% |
| 23 | Texas patch-nosed snake Salvadora lineata | 1 | 1% |
| 24 | Checkered garter snake Thamnophis marcianus | — | — |
| 25 | Great Plains ground snake Sonora episcopa | — | — |
When are snakes out in Williamson County?
Observation records of snakes in Williamson County run mostly March through October, peaking in May with 17% of them; across Texas the peak is April.
What spiders are in Williamson County?
In all, 78 spider species are on the Williamson County list. The most recorded are Cicurina varians (229), Agyneta llanoensis (104) and Tigrosa annexa (91). Williamson County holds more than half of all Texas records of Agyneta llanoensis, Mermessus albulus and Tayshaneta anopica.
Related species: Cicurina arcuata
Related species: Agyneta micaria
| # | Species | Records | Share of Texas records |
|---|---|---|---|
| 1 | Cicurina varians | 229 | 45% |
| 2 | Agyneta llanoensis | 104 | 62% |
| 3 | Tigrosa annexa | 91 | 28% |
| 4 | Cryptachaea porteri | 66 | 36% |
| 5 | Cave cobweb spider Eidmannella pallida | 55 | 42% |
| 6 | Rabid wolf spider Rabidosa rabida | 54 | 5% |
| 7 | Black-and-yellow argiope Argiope aurantia | 49 | 2% |
| 8 | Cribellate spider Metaltella simoni | 40 | 17% |
| 9 | Hogna antelucana | 31 | 4% |
| 10 | Twin-flagged jumping spider Anasaitis canosa | 28 | 4% |
| 11 | Tayshaneta paraconcinna | 23 | 35% |
| 12 | Nursery web spider Pisaurina mira | 20 | 5% |
| 13 | Georgia wolf spider Tigrosa georgicola | 19 | 11% |
| 14 | Bold jumper Phidippus audax | 18 | 1% |
| 15 | Green lynx spider Peucetia viridans | 16 | 2% |
| 16 | Texas brown tarantula Aphonopelma hentzi | 16 | 5% |
| 17 | Falconina gracilis | 14 | 7% |
| 18 | Familiar jumping spider Platycryptus undatus | 14 | 3% |
| 19 | Banded fishing spider Dolomedes vittatus | 13 | 27% |
| 20 | Spotted orbweaver Neoscona crucifera | 13 | 3% |
| 21 | Dotted wolf spider Rabidosa punctulata | 12 | 11% |
| 22 | Mermessus albulus | 12 | 55% |
| 23 | Phidippus arizonensis | 12 | 12% |
| 24 | Tayshaneta anopica | 11 | 100% |
| 25 | Spiny-backed orbweaver Gasteracantha cancriformis | 9 | 1% |
| 26 | Western spotted orbweaver Neoscona oaxacensis | 8 | 2% |
| 27 | Furrow orbweaver Larinioides cornutus | 7 | 6% |
| 28 | Giant lichen orbweaver Araneus bicentenarius | 7 | 4% |
| 29 | Pardosa mercurialis | 7 | 6% |
| 30 | Pisaurina dubia | 7 | 17% |
| 31 | Sixspotted fishing spider Dolomedes triton | 7 | 4% |
| 32 | Banded garden spider Argiope trifasciata | 6 | 3% |
| 33 | Carolina jumping spider Phidippus carolinensis | 6 | 4% |
| 34 | Common house spider Parasteatoda tepidariorum | 6 | 10% |
| 35 | High eye-lashed jumping spider Phidippus mystaceus | 6 | 15% |
| 36 | Triangulate bud spider Steatoda triangulosa | 6 | 2% |
| 37 | Dysdera crocata | 5 | 14% |
| 38 | Lance wolf spider Schizocosa avida | 5 | 3% |
| 39 | Striped lynx spider Oxyopes salticus | 5 | 1% |
| 40 | Cyclosa turbinata | 4 | 5% |
| 41 | Phidippus texanus | 4 | 3% |
| 42 | Wetland giant wolf spider Tigrosa helluo | 4 | 4% |
| 43 | Cardinal jumper Phidippus cardinalis | 3 | 3% |
| 44 | Celer crab spider Mecaphesa celer | 3 | 2% |
| 45 | Leucauge argyrobapta | 3 | 1% |
| 46 | Lined orbweaver Mangora gibberosa | 3 | 3% |
| 47 | Shoreline wolf spider Arctosa littoralis | 3 | 3% |
| 48 | Arabesque orbweaver Neoscona arabesca | 2 | 1% |
| 49 | Bronze jumper Eris militaris | 2 | 1% |
| 50 | Colonus puerperus | 2 | 2% |
| 51 | Common Hentz jumping spider Hentzia palmarum | 2 | 1% |
| 52 | Deadly ground crab spider Xysticus funestus | 2 | 3% |
| 53 | Habronattus fallax | 2 | 5% |
| 54 | Humpbacked orbweaver Eustala anastera | 2 | 2% |
| 55 | Mecaphesa dubia | 2 | 2% |
| 56 | Orchard orbweaver Leucauge venusta | 2 | 2% |
| 57 | Peppered jumper Pelegrina galathea | 2 | 1% |
| 58 | Southern black widow venomous Latrodectus mactans | 2 | 1% |
| 59 | Teminius affinis | 2 | 6% |
| 60 | Brown recluse venomous Loxosceles reclusa | 1 | 1% |
When are spiders out in Williamson County?
Observation records of spiders in Williamson County run through most of the year, peaking in June with 12% of them; across Texas the peak is April.
What stands out in Williamson County
Species for which Williamson County holds a large share of all Texas records: Agyneta llanoensis, 62% (104 of 167); Mermessus albulus, 55% (12 of 22); Cicurina varians, 45% (229 of 514); the cave cobweb spider, 42% (55 of 132); Cryptachaea porteri, 36% (66 of 185); Tayshaneta paraconcinna, 35% (23 of 66); Tigrosa annexa, 28% (91 of 330); the banded fishing spider, 27% (13 of 48).
Common in Texas, not on the Williamson County list
Among the snakes most recorded across Texas, these do not reach the county list: the western ground snake (1,963 statewide) and the eastern copperhead (1,188 statewide). Few records here can mean the species is rare in the county, or that few people have looked.
Harmless lookalikes in Williamson County
Copperheads are on the county list, and so are harmless species often taken for them: the plain-bellied watersnake and the eastern hog-nosed snake. Cottonmouths are on the county list, and so are harmless species often taken for them: the plain-bellied watersnake and the diamondback water snake. Rattlesnakes are on the county list, and so are harmless species often taken for them: the eastern hog-nosed snake, the Great Plains rat snake and the gopher snake. Widow spiders are on the county list, and so are harmless species often taken for them: the common house spider and the triangulate bud spider. Recluse spiders are on the county list, and so are harmless species often taken for them: the longbodied cellar spider.
Williamson County among Texas counties
By licensed snake records Williamson County ranks 14th of 254 Texas counties with any.
Other Texas counties with their own page: Travis County, Brewster County, Harris County, Brazos County, El Paso County, Jeff Davis County, Val Verde County and Bexar County.
The whole state: venomous species in Texas, all snakes, all spiders.
GBIF records read 2026-09-29. Listed: any license. Counted: CC0/CC BY only. How we count.