Sunizona, AZ planting calendar
- USDA zone
- 8a10 to 15 °F
- Last frost
- Apr 14avg, 32°F
- First frost
- Nov 2avg, 32°F
- Growing season
- 200days
Sunizona, Arizona is in USDA plant hardiness zone 8a. Its average last spring frost is around April 14 and the first fall frost around November 2, giving a growing season of about 200 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Sunizona planting calendar
Each crop's windows are counted from Sunizona's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Feb 17 – Mar 3 | Apr 21 – Apr 28 | Jun 20 – Jul 10 | — |
| Pepper | Very tender | Feb 3 – Feb 17 | Apr 28 – May 5 | Jun 27 – Jul 27 | — |
| Cucumber | Tender | Mar 17 – Mar 24 | Apr 21 – Apr 28 | Jun 10 – Jun 30 | — |
| Summer squash / zucchini | Tender | — | Apr 21 – Apr 28 | Jun 5 – Jun 20 | — |
| Bush bean | Tender | — | Apr 21 – Apr 28 | Jun 10 – Jun 20 | Sep 3 – Sep 13 |
| Sweet corn | Tender | — | Apr 14 – Apr 28 | Jun 13 – Jul 13 | — |
| Basil | Very tender | Mar 3 – Mar 17 | Apr 21 – Apr 28 | May 21 – Jun 5 | — |
| Lettuce | Half-hardy | Mar 3 – Mar 17 | Mar 17 – Mar 31 | May 1 – May 16 | Aug 20 – Sep 4 |
| Pea | Hardy | — | Mar 3 – Mar 17 | Apr 27 – May 12 | Aug 10 – Aug 25 |
| Spinach | Hardy | — | Mar 3 – Mar 17 | Apr 12 – Apr 22 | Aug 30 – Sep 9 |
| Carrot | Half-hardy | — | Mar 24 – Mar 31 | May 23 – Jun 12 | Jul 31 – Aug 20 |
| Broccoli | Half-hardy | Feb 17 – Mar 3 | Mar 17 – Mar 31 | May 11 – May 31 | Aug 5 – Aug 25 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USC00026353. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | Apr 28 | May 10 | Oct 24 | Nov 5 | 178 |
| 32°F (freeze) | Apr 14 | Apr 30 | Nov 2 | Nov 16 | 200 |
| 28°F | Mar 27 | Apr 16 | Nov 13 | Nov 29 | 228 |
| 24°F | Mar 4 | Mar 29 | Nov 26 | Dec 13 | 267 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 4,797 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 7,942 | cool-season crops (brassicas, greens) |
Hardiness zone 8a
Sunizona sits in USDA plant hardiness zone 8a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 10 to 15 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 8a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Sunizona?
- Sunizona, Arizona is in USDA plant hardiness zone 8a on the 2023 map (average annual extreme minimum temperature 10 to 15 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Sunizona?
- The average (median) last spring frost at 32°F is around April 14, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as April 30, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Sunizona?
- The average first fall frost at 32°F is around November 2. That leaves a growing season of about 200 days between the average last spring and first fall frosts.
- When should I start tomatoes in Sunizona?
- Start tomato seeds indoors about Feb 17 – Mar 3 and transplant them outside about Apr 21 – Apr 28, once the danger of frost has passed. Estimated first harvest is around Jun 20 – Jul 10.
- How long is the growing season in Sunizona?
- About 200 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~April 14) and the average first fall frost (~November 2). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USC00026353 (Pearce - Sunsites, 17.7 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.