USDA Hardiness Zone 12b
Frost Dates for 96813 — Honolulu, Hawaii
Averages from Kanalohuluhulu 1075, Hi US, the nearest reporting station, 128.7 miles away.
Plant tender crops after January 26, and expect the first autumn freeze around January 24. That leaves about 365 frost-free days.
- Last spring frost
- January 26
- First fall frost
- January 24
- Growing season
- 365 days
- Hardiness zone
- 12b
50% probability
50% probability
frost-free
55 to 60°F annual low
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
When it snows in Honolulu, Hawaii
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Beretania Pump Stn 705, Hi US, 0.5 miles away, so there is no typical first-snow date to plan around.
For a gardener, snow matters less than frost: a light snow on frozen ground changes nothing, while a hard frost on an unprotected bed ends the season. Use the frost dates above for planting and the snow dates for getting hoses drained, mulch down and tender pots indoors.
Planting calendar for 96813
| When | What to do |
|---|---|
| November 17 – December 1 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| December 1 – December 15 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| December 29 – January 12 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| January 26 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by November 1 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by January 10 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| January 24 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 26 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Honolulu, Hawaii are past their last freeze. Harvest before January 24, which leaves roughly 365 frost-free days.
ZIP 96813 sits in USDA hardiness zone 12b, meaning the average coldest night of the year falls between 55 to 60°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.