USDA hardiness zone lookup
Augusta (04330) — USDA Zone 5b
Augusta, Maine · 136-day growing season
Frost dates and growing season for 04330
| USDA hardiness zone | Zone 5b |
|---|---|
| Average last spring frost | May 13 |
| Average first fall frost | September 26 |
| Growing season length | ~136 days |
| Temperature range (F) | -20 to -10°F |
| Temperature range (C) | -29 to -23°C |
These are 50%-probability averages modeled from this ZIP's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by May 13, but in a colder-than-average year it can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Augusta
Augusta, Maine sits in USDA Zone 5b, with roughly 136 frost-free days between an average last spring frost around May 13 and a first fall frost around September 26. That is a standard temperate season — most common vegetables finish comfortably, and a single main planting plus one succession round works well. Augusta lies near 44.3°N; higher-latitude gardens get longer midsummer days but a tighter shoulder season at this zone.
What grows in Augusta
Augusta falls in USDA Zone 5b, which means the same hardiness constraints apply as the full Zone 5 guide. Vegetables, herbs, and fruit trees rated to Zone 5b (or hardier) will overwinter here in a typical year.
- Tomatoes (full range of varieties)
- Peppers
- Eggplant
- Squash, melons, cucumbers
- Beans (bush + pole)
- Sweet corn
- Apples, pears, plums
- Cherries (sweet + sour)
- Blueberries, raspberries
- Garlic
What to plant in Augusta this week
Augusta's last frost is around May 13. This is the spring transplant window — start tomatoes and peppers indoors if you haven't, and direct-sow cold-tolerant crops now.
- When to plant tomatoes in zone 5
- When to plant peppers in zone 5
- When to plant basil in zone 5
- When to plant bush beans in zone 5
- When to plant cucumbers in zone 5
Full planting calendar for Augusta
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 5 averages:
- When to plant tomatoes in zone 5
- When to plant peppers in zone 5
- When to plant basil in zone 5
- When to plant garlic in zone 5
- When to plant lettuce in zone 5
- When to plant bush beans in zone 5
- When to plant cucumbers in zone 5
- When to plant summer squash in zone 5
- When to plant peas in zone 5
- When to plant carrots in zone 5
Local microclimate notes
Zone tables give you the average — but Augustagardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record (the last time you actually got frost damage) is more accurate than any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from this ZIP's USDA hardiness zone and regional NOAA 1991-2020 climate normals — they are zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations are drawn from US Cooperative Extension references and curated by the Growli editorial team. Last reviewed May 2026.
Nearby ZIP codes in Maine
- 04101 — Portland (Zone 6a)
- 04401 — Bangor (Zone 5a)
- 04102 — Portland (Deering) (Zone 6a)
- 04240 — Lewiston (Zone 5b)
- 04005 — Biddeford (Zone 5b)
- 04901 — Waterville (Zone 5a)
- 04106 — South Portland (Zone 6a)
- Browse all US ZIP codes by state