Aguanga, CA 92060 planting calendar
- USDA zone
- 9a20 to 25 °F
- Last frost
- Apr 29avg, 32°F
- First frost
- Nov 18avg, 32°F
- Growing season
- 201days
Aguanga, California is in USDA plant hardiness zone 9a. Its average last spring frost is around April 29 and the first fall frost around November 18, giving a growing season of about 201 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.
Aguanga planting calendar
Each crop's windows are counted from Aguanga'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 | Mar 4 – Mar 18 | May 6 – May 13 | Jul 5 – Jul 25 | — |
| Pepper | Very tender | Feb 18 – Mar 4 | May 13 – May 20 | Jul 12 – Aug 11 | — |
| Cucumber | Tender | Apr 1 – Apr 8 | May 6 – May 13 | Jun 25 – Jul 15 | — |
| Summer squash / zucchini | Tender | — | May 6 – May 13 | Jun 20 – Jul 5 | — |
| Bush bean | Tender | — | May 6 – May 13 | Jun 25 – Jul 5 | Sep 19 – Sep 29 |
| Sweet corn | Tender | — | Apr 29 – May 13 | Jun 28 – Jul 28 | — |
| Basil | Very tender | Mar 18 – Apr 1 | May 6 – May 13 | Jun 5 – Jun 20 | — |
| Lettuce | Half-hardy | Mar 18 – Apr 1 | Apr 1 – Apr 15 | May 16 – May 31 | Sep 5 – Sep 20 |
| Pea | Hardy | — | Mar 18 – Apr 1 | May 12 – May 27 | Aug 26 – Sep 10 |
| Spinach | Hardy | — | Mar 18 – Apr 1 | Apr 27 – May 7 | Sep 15 – Sep 25 |
| Carrot | Half-hardy | — | Apr 8 – Apr 15 | Jun 7 – Jun 27 | Aug 16 – Sep 5 |
| Broccoli | Half-hardy | Mar 4 – Mar 18 | Apr 1 – Apr 15 | May 26 – Jun 15 | Aug 21 – Sep 10 |
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 USC00046657. 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 | May 19 | Jun 7 | Nov 1 | Nov 21 | 165 |
| 32°F (freeze) | Apr 29 | May 29 | Nov 18 | Dec 8 | 201 |
| 28°F | Apr 5 | May 5 | Dec 6 | Dec 31 | 243 |
| 24°F | Mar 4 | Apr 15 | Dec 25 | Feb 19 | 291 |
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) | 3,690 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 6,500 | cool-season crops (brassicas, greens) |
Hardiness zone 9a
Aguanga sits in USDA plant hardiness zone 9a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 20 to 25 °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 9a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Aguanga?
- Aguanga, California is in USDA plant hardiness zone 9a on the 2023 map (average annual extreme minimum temperature 20 to 25 °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 Aguanga?
- The average (median) last spring frost at 32°F is around April 29, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as May 29, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Aguanga?
- The average first fall frost at 32°F is around November 18. That leaves a growing season of about 201 days between the average last spring and first fall frosts.
- When should I start tomatoes in Aguanga?
- Start tomato seeds indoors about Mar 4 – Mar 18 and transplant them outside about May 6 – May 13, once the danger of frost has passed. Estimated first harvest is around Jul 5 – Jul 25.
- How long is the growing season in Aguanga?
- About 201 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~April 29) and the average first fall frost (~November 18). 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 USC00046657 (Palomar Mtn Obsy, 3.8 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.