USDA Hardiness Zone 9b
Frost Dates for 93638 — Madera, California
Averages from Madera, Ca US, the nearest reporting station, 3.8 miles away.
Plant tender crops after February 18, and expect the first autumn freeze around November 27. That leaves about 281 frost-free days.
- Last spring frost
- February 18
- First fall frost
- November 27
- Growing season
- 281 days
- Hardiness zone
- 9b
50% probability
50% probability
frost-free
25 to 30°F annual low
Planting calendar for 93638
| When | What to do |
|---|---|
| December 10 – December 24 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| December 24 – January 7 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| January 21 – February 4 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| February 18 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by September 4 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by November 13 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| November 27 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 February 18 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Madera, California are past their last freeze. Harvest before November 27, which leaves roughly 281 frost-free days.
ZIP 93638 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.