USDA Hardiness Zone 9b
Frost Dates for 89109 — Las Vegas, Nevada
Averages from Las Vegas Mccarran Ap, Nv US, the nearest reporting station, 3.8 miles away.
Plant tender crops after January 20, and expect the first autumn freeze around December 15. That leaves about 333 frost-free days.
- Last spring frost
- January 20
- First fall frost
- December 15
- Growing season
- 333 days
- Hardiness zone
- 9b
50% probability
50% probability
frost-free
25 to 30°F annual low
Planting calendar for 89109
| When | What to do |
|---|---|
| November 11 – November 25 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| November 25 – December 9 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| December 23 – January 6 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| January 20 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by September 22 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by December 1 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| December 15 onward | Plant garlic, mulch beds, lift tender bulbs Garlic wants a cold spell; bare soil loses structure over winter. |
What these dates mean
Wait until after January 20 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Las Vegas, Nevada are past their last freeze. Harvest before December 15, which leaves roughly 333 frost-free days.
ZIP 89109 sits in USDA hardiness zone 9b, meaning the average coldest night of the year falls between 25 to 30°F. Zone decides what survives the winter; frost dates decide when to plant each spring. They are different questions, and a plant can pass one and fail the other.
These are thirty-year NOAA averages for 1991–2020, not a forecast. Any individual year can frost two to three weeks either side of these dates, so check the actual forecast before planting out.