USDA Hardiness Zone 9b
Frost Dates for 85658 — Marana, Arizona
Averages from Catalina Sp, Az US, the nearest reporting station, 14.8 miles away.
Plant tender crops after April 2, and expect the first autumn freeze around November 11. That leaves about 222 frost-free days.
- Last spring frost
- April 2
- First fall frost
- November 11
- Growing season
- 222 days
- Hardiness zone
- 9b
50% probability
50% probability
frost-free
25 to 30°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 Marana, Arizona
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Picacho 8 Se, Az US, 16.9 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 85658
| When | What to do |
|---|---|
| January 22 – February 5 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| February 5 – February 19 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| March 5 – March 19 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| April 2 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by August 19 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by October 28 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| November 11 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 April 2 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Marana, Arizona are past their last freeze. Harvest before November 11, which leaves roughly 222 frost-free days.
ZIP 85658 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.